html {
    font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard Variable", Pretendard, Roboto,
        "Noto Sans KR", "Segoe UI", "Malgun Gothic", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol",
        sans-serif;
    background: linear-gradient(#000006, #100331, #784168, #784168, #100331, #000006);
    background-size: 100vw 200vh;
    height: 100vh;
}

* {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

img {
    height: 200px;
    animation: updown linear 4.2s both infinite;
    margin-top: 10vh;
    margin-bottom: 50px;
}

h1 {
    font-weight: 900;
    font-size: 2rem;
    margin-bottom: 10px;
    color: #ffffff;
}

p {
    font-size: 1.25rem;
    margin-bottom: 7px;
    color: #cdcdcd;
}

footer {
    position: absolute;
    bottom: 20px;
    width: 100vw;
    padding: 5px;
    word-break: keep-all;
}

footer p {
    font-size: 14px;
}

footer b {
    color: #fff;
}

@media (min-width: 768px) {
    img {
        height: 300px;
    }

    h1 {
        font-size: 2.5rem;
    }

    p {
        font-size: 1.75rem;
    }

    a {
        font-size: 20px;
    }

    footer p {
        font-size: 16px;
    }
}

div {
    margin-top: 15px;
}

a {
    display: inline-block;
    text-decoration: none;
    color: var(--text);
    border: var(--color) 1px solid;
    border-radius: 0.25rem;
    background-color: var(--color);
    margin: 4px;
    padding: 10px;
    padding-left: 15px;
    padding-right: 15px;
}

a:hover,
a:focus {
    outline: none;
    filter: drop-shadow(0 0 3px var(--color));
}

@keyframes updown {
    0% {
        transform: translateY(7px);
    }
    50% {
        transform: translateY(-7px);
    }
    100% {
        transform: translateY(7px);
    }
}