style.css

@import url(https://fonts.googleapis.com/earlyaccess/hanna.css);
@import url(https://fonts.googleapis.com/earlyaccess/notosanskr.css);

body {
    background-color: rgb(37, 37, 37);
    color: rgb(205, 205, 205);
}

.title {
    font-family: 'Hanna', sans-serif;
    font-size: 40px;
    background: linear-gradient(90deg, red, orange, yellow, green, blue, navy, purple);
    color: transparent;
    -webkit-background-clip: text;
}

.name {
    font-family: 'Hanna', sans-serif;
    font-size: 40px;
    background: linear-gradient(90deg, red, orange, yellow, green, blue, navy, purple);
    color: transparent;
    -webkit-background-clip: text;
    padding-left: 20%;
    padding-right: 20%;
}

.tableOfContents {
    font-size: 25px;
    font-weight: bold;
    box-align: center;
    padding: 10px;
    margin: 0 auto;
    width: 500px;
    height: auto;
    background-color: rgb(20, 20, 20);
    color: rgb(205, 205, 205);
}

.main {
    font-family: 'Noto Sans KR', sans-serif;
    font-size: 20px;
    padding: 10px;
    margin: 0 auto;
    width: 800px;
    height: auto
}

@media (max-width: 900px) {

    .main {
        width: 90%;
    }
}

@media (max-width: 500px) {
    .tableOfContents {
        width: 100%;
    }
}

.hyperlink {
    font-size: larger;
    font-weight: bold;
}

#toTheTopBtn {
    position: fixed;
    bottom: 30px;
    right: 25%;
    z-index: 99;
    border: none;
    outline: none;
    background-color: black;
    color: rgb(205, 205, 205);
    cursor: auto;
    padding: 15px;
    border-radius: 10px;
    font-size: 25px;
}

a {
    text-decoration-line: none;
}

html {
    scroll-behavior: smooth;
}