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Assembler CSS

asmcss

Just-in-time CSS, unlimited possibilities

Quickly prototype and build astonishing websites and UI components without installing and maintaining complicated software stacks.

Modern UI framework

Static CSS frameworks are shipped bundled with hundreds of classes you never use, resulting in higher load times. Assembler's critical mission is to improve the performance of your website by generating only the minimum amount of CSS each webpage needs.

Reusability for the win

Stop wasting your time by being redundant and create reusable mixins directly inside your CSS code. Apply them to your UI components and experience a better way of making web pages: no hassle, no preprocessing, no software to install.

Learn more about sponsoring developers and organizations.

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$ a month

You'll receive any rewards listed in the $5 monthly tier. Additionally, a Public Sponsor achievement will be added to your profile.

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Become a sponsor to
Assembler CSS
@asmcss
Assembler CSS
asmcss
Just-in-time CSS, unlimited possibilities
Quickly prototype and build astonishing websites and UI components without installing and maintaining complicated software stacks.
Modern UI framework
Static CSS frameworks are shipped bundled with hundreds of classes you never use, resulting in higher load times. Assembler's critical mission is to improve the performance of your website by generating only the minimum amount of CSS each webpage needs.
Reusability for the win
Stop wasting your time by being redundant and create reusable mixins directly inside your CSS code. Apply them to your UI components and experience a better way of making web pages: no hassle, no preprocessing, no software to install.
Learn more about sponsoring developers and organizations.

Report abuse
Select a tier
$
a month


You'll receive any rewards listed in the $5 monthly tier. Additionally, a Public Sponsor achievement will be added to your profile.


$5 a month

Select
  • Get a Sponsor badge on your profile

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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You must be logged in to sponsor asmcss


Become a sponsor to
Assembler CSS
@asmcss
Assembler CSS
asmcss
Just-in-time CSS, unlimited possibilities
Quickly prototype and build astonishing websites and UI components without installing and maintaining complicated software stacks.
Modern UI framework
Static CSS frameworks are shipped bundled with hundreds of classes you never use, resulting in higher load times. Assembler's critical mission is to improve the performance of your website by generating only the minimum amount of CSS each webpage needs.
Reusability for the win
Stop wasting your time by being redundant and create reusable mixins directly inside your CSS code. Apply them to your UI components and experience a better way of making web pages: no hassle, no preprocessing, no software to install.
Learn more about sponsoring developers and organizations.

Report abuse
Select a tier
$
a month


You'll receive any rewards listed in the $5 monthly tier. Additionally, a Public Sponsor achievement will be added to your profile.


$5 a month

Select
  • Get a Sponsor badge on your profile

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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You must be logged in to sponsor asmcss


Become a sponsor to
Assembler CSS
@asmcss
Assembler CSS
asmcss
Just-in-time CSS, unlimited possibilities
Quickly prototype and build astonishing websites and UI components without installing and maintaining complicated software stacks.
Modern UI framework
Static CSS frameworks are shipped bundled with hundreds of classes you never use, resulting in higher load times. Assembler's critical mission is to improve the performance of your website by generating only the minimum amount of CSS each webpage needs.
Reusability for the win
Stop wasting your time by being redundant and create reusable mixins directly inside your CSS code. Apply them to your UI components and experience a better way of making web pages: no hassle, no preprocessing, no software to install.
Learn more about sponsoring developers and organizations.

Report abuse
Select a tier
$
a month


You'll receive any rewards listed in the $5 monthly tier. Additionally, a Public Sponsor achievement will be added to your profile.


$5 a month

Select
  • Get a Sponsor badge on your profile

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content

You must be logged in to sponsor asmcss


Become a sponsor to
Assembler CSS
@asmcss
Assembler CSS
asmcss
Just-in-time CSS, unlimited possibilities
Quickly prototype and build astonishing websites and UI components without installing and maintaining complicated software stacks.
Modern UI framework
Static CSS frameworks are shipped bundled with hundreds of classes you never use, resulting in higher load times. Assembler's critical mission is to improve the performance of your website by generating only the minimum amount of CSS each webpage needs.
Reusability for the win
Stop wasting your time by being redundant and create reusable mixins directly inside your CSS code. Apply them to your UI components and experience a better way of making web pages: no hassle, no preprocessing, no software to install.
Learn more about sponsoring developers and organizations.

Report abuse
Select a tier
$
a month


You'll receive any rewards listed in the $5 monthly tier. Additionally, a Public Sponsor achievement will be added to your profile.


$5 a month

Select
  • Get a Sponsor badge on your profile

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content

You must be logged in to sponsor asmcss


Become a sponsor to
Assembler CSS
@asmcss
Assembler CSS
asmcss
Just-in-time CSS, unlimited possibilities
Quickly prototype and build astonishing websites and UI components without installing and maintaining complicated software stacks.
Modern UI framework
Static CSS frameworks are shipped bundled with hundreds of classes you never use, resulting in higher load times. Assembler's critical mission is to improve the performance of your website by generating only the minimum amount of CSS each webpage needs.
Reusability for the win
Stop wasting your time by being redundant and create reusable mixins directly inside your CSS code. Apply them to your UI components and experience a better way of making web pages: no hassle, no preprocessing, no software to install.
Learn more about sponsoring developers and organizations.

Report abuse
Select a tier
$
a month


You'll receive any rewards listed in the $5 monthly tier. Additionally, a Public Sponsor achievement will be added to your profile.


$5 a month

Select
  • Get a Sponsor badge on your profile

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content

You must be logged in to sponsor asmcss


Become a sponsor to
Assembler CSS
@asmcss
Assembler CSS
asmcss
Just-in-time CSS, unlimited possibilities
Quickly prototype and build astonishing websites and UI components without installing and maintaining complicated software stacks.
Modern UI framework
Static CSS frameworks are shipped bundled with hundreds of classes you never use, resulting in higher load times. Assembler's critical mission is to improve the performance of your website by generating only the minimum amount of CSS each webpage needs.
Reusability for the win
Stop wasting your time by being redundant and create reusable mixins directly inside your CSS code. Apply them to your UI components and experience a better way of making web pages: no hassle, no preprocessing, no software to install.
Learn more about sponsoring developers and organizations.

Report abuse
Select a tier
$
a month


You'll receive any rewards listed in the $5 monthly tier. Additionally, a Public Sponsor achievement will be added to your profile.


$5 a month

Select
  • Get a Sponsor badge on your profile

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content

You must be logged in to sponsor asmcss


Become a sponsor to
Assembler CSS
@asmcss
Assembler CSS
asmcss
Just-in-time CSS, unlimited possibilities
Quickly prototype and build astonishing websites and UI components without installing and maintaining complicated software stacks.
Modern UI framework
Static CSS frameworks are shipped bundled with hundreds of classes you never use, resulting in higher load times. Assembler's critical mission is to improve the performance of your website by generating only the minimum amount of CSS each webpage needs.
Reusability for the win
Stop wasting your time by being redundant and create reusable mixins directly inside your CSS code. Apply them to your UI components and experience a better way of making web pages: no hassle, no preprocessing, no software to install.
Learn more about sponsoring developers and organizations.

Report abuse
Select a tier
$
a month


You'll receive any rewards listed in the $5 monthly tier. Additionally, a Public Sponsor achievement will be added to your profile.


$5 a month

Select
  • Get a Sponsor badge on your profile