index.css

:root {
 --main-color: #fa5252;
}

body,html {
 padding:0px;
 margin:0px;
 font-family: 'Noto Sans KR', sans-serif;
 font-weight:bold;
 color:#fff;
 background:rgb(0, 0, 0);
 scroll-behavior: smooth;
}

#loading {
 width: 100vw;
 height: 100vh;
 position: fixed;
 background: #000;
 z-index: 999;
 display: flex;
 justify-content: center;
 flex-direction: column;
 align-items: center;
}
#spinner {
 animation: rotate 0.56s infinite linear;
 width:60px;
 height:60px;
 border:6px solid #fff;
 border-bottom:6px solid #000;
 border-radius:50%;
 margin:0;
}
@keyframes rotate {
 0% {transform: rotate(0deg);}
 100% {transform: rotate(360deg);}
}
#header {
 width:80%;
 padding:4% 10%;
 text-align:center;
 position:absolute;
 transition:0.6s ease-in-out;
}
#header div {
 display:block;
}
#title {
 font-size:40px;
 color: var(--main-color);
}
#links {
 margin:40px 0px;
 transition:0.6s ease-in-out;
 color:#fff;
}
#links a {
 margin:0px 30px;
 color:inherit;
 text-decoration:none;
 transition:0.4s ease-in-out;
 padding:5px 8px;
 border-bottom:2px solid transparent;
}
#links a:hover {
 border-bottom:2px solid #fff;
}
#middle {
 width:100%;
 height:80vh;
 display: flex;
 flex-direction: column;
 align-items: center;
 justify-content: center;
 background: linear-gradient(0deg,rgba(0,0,0,1),rgba(0,0,0,0)),
 url("https://images.unsplash.com/photo-1494587351196-bbf5f29cff42?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&&w=1351&q=80") center center fixed;

 background-size:100% auto;
 background-repeat:no-repeat;
 color:white;
 display:flex;
 justify-content:center;
 flex-direction:column;
 transition:1s ease-in-out;
 padding-top:15vh;
}
#tagline {
 font-size:50px;
 width:60%;
 display: flex;
 flex-direction: column;
 align-items: center;
 text-align: center;
}
#portfolio {
 width:80%;
 padding:2% 10%;
}
#portfolio div h1 {
 font-size:40px;
 color: #fa5252;
}
#skills {
 margin:4vh 0px !important;
 padding:2vh 0px !important;
}
#work {
 margin:4vh 0px !important;
 padding:2vh 0px !important;
}
#contact {
 margin:4vh 0px !important;
 padding:2vh 0px !important;
}
#contact form {
 width:100%;
}
#contact form input {
 width:46%;
 margin:20px 1%;
 background:transparent;
 border:0px;
 border-bottom:2px solid rgba(255,255,255,0.5);
 padding:8px 10px;
 font-size:18px;
 transition:0.4s ease-in-out;
 color:#fff;
}
#contact form textarea {
 width:96%;
 margin:20px 1%;
 padding:8px 10px;
 border:0px;
 border-bottom:2px solid rgba(255,255,255,0.5);
 padding:8px 10px;
 font-size:18px;
 background:transparent;
 resize:none;
 transition:0.4s ease-in-out;
 color:#fff;
}
#contact form input:focus {
 outline:none;
 border-bottom:2px solid rgba(255,255,255,1);
}
#contact form textarea:focus {
 outline:none;
 border-bottom:2px solid rgba(255,255,255,1);
}
::placeholder {
 color:#fff;
}
.btn_one {
 color:white;
 padding:10px 40px;
 border-radius:50px;
 border:2px solid #fff;
 font-size:18px;
 font-weight:bold;
 background:transparent;
 transition:0.4s ease-in-out;
 margin:30px 10px;
}
.btn_one:hover {
 background:white;
 cursor:pointer;
 color:#000;
}
.project div {
 font-weight:normal;
}
.btn_two {
 color:#000;
 padding:10px 40px;
 border-radius:50px;
 border:2px solid #fff;
 font-size:18px;
 font-weight:bold;
 background:#fff;
 transition:0.4s ease-in-out;
 margin:30px 10px;
}
.btn_two:hover {
 background:transparent;
 cursor:pointer;
 color:#fff;
}
#details {
 margin:6vh 0px;
}
.btn_social {
 font-size:18px;
 color:#fff;
 margin:40px 20px;
 padding:15px 18px;
 border-radius:50%;
 background:#000;
 transition:0.4s ease-in-out;
}
.btn_social:hover {
 color:#000;
 background:#fff;
 cursor:pointer;
}
@media (max-width: 900px){
 #header {
 width:94%;
 padding:15% 3%;
 }
 #title {
 font-size:30px;
 }
 #links {
 margin:30px 0px;
 }
 #links a {
 margin:0px;
 }
 #middle {
 width:100%;
 border-radius:0px;
 height:80vh;
 background-size:cover;
 }
 #tagline {
 width:90%;
 font-size:30px;
 }
 .btn_one {
 font-size:14px;
 padding:8px 20px;
 }
 .btn_two {
 font-size:14px;
 padding:8px 20px;
 }
 #contact form input {
 width:92%;
 }
 #contact form textarea {
 width:92%;
 }
 .btn_social {
 font-size:14px;
 margin:10px;
 padding:10px 11px;
 }
}
#footer {
 width:100%;
 padding:10vh 0px;
 text-align:center;
 font-weight:bold;
}
#footer a {
 font-size:18px;
 background-image: linear-gradient(to left, #FF416C 0%, #FF4B2B 100%);
 -webkit-background-clip:text;
 background-clip:text;
 -webkit-text-fill-color: transparent;
 background-size:500% 500% !important;
 -webkit-animation: Gradient 20s ease infinite;
 -moz-animation: Gradient 20s ease infinite;
 -o-animation: Gradient 20s ease infinite;
 animation: Gradient 20s ease infinite;
 text-decoration:none;
}
button:focus {
 outline:none;
}
::-webkit-scrollbar {
 width:5px;
 height:5px;
}
::-webkit-scrollbar-track {
 background: #f1f1f1; 
}
::-webkit-scrollbar-thumb {
 background: #000; 
}
::-webkit-scrollbar-thumb:hover {
 background: #555; 
}
@-webkit-keyframes Gradient {
0% {background-position: 0% 50%}
50% {background-position: 100% 50%}
100% {background-position: 0% 50%}
}
@-moz-keyframes Gradient {
0% {background-position: 0% 50%}
50% {background-position: 100% 50%}
100% {background-position: 0% 50%}
}
@keyframes Gradient {
0% {background-position: 0% 50%}
50% {background-position: 100% 50%}
100% {background-position: 0% 50%}
}

p {
 font-size: 1.2rem;
 font-weight: normal;
}