layout.css

/* General style */

html {
    display: flex;
    justify-content: center;
}

html > body {
    width: 1000px;
    margin: 0;
}

html body a {
    color: #294056;
}

div, h1, h2, h3, h4, h5, h6, p, a, li {
    font-family: raleway, sans-serif;
    color: #333333;
}

/* Github corner icon */

.github-corner:hover .octo-arm {
    animation: octocat-wave 560ms ease-in-out;
}

.github-corner svg {
    fill: #343434;
    color: white;
    position: absolute;
    top: 0;
    border: 0;
    right: 0;
}

@keyframes octocat-wave {
    0%,
    100% {
        transform: rotate(0);
    }
    20%,
    60% {
        transform: rotate(-25deg);
    }
    40%,
    80% {
        transform: rotate(10deg);
    }
}

@media (max-width: 500px) {
    .github-corner:hover .octo-arm {
        animation: none;
    }

    .github-corner .octo-arm {
        animation: octocat-wave 560ms ease-in-out;
    }
}

/* Animation style */

#animation {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    height: 700px;
}

#animation > h2 {
    color: #526878;
}

#animation > div {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid lightgray;
    width: 300px;
    height: 350px;
    padding-top: 10px;
}

#animation .play-button {
    position: absolute;
    top: 0;
    left: 0;
    cursor: pointer;
    font-size: 50px;
    padding: 0 15px;
    user-select: none;
    color: #586c7f;
}

#animation .play-button:active {
    top: 1px;
    left: 1px;
}

#animation ul {
    list-style-type: none;
    padding-left: 0;
    margin: 0;
}

#animation ul li {
    margin: 10px 0;
}

#animation ul li > div:first-child {
    width: 80px;
    height: 10px;
    background-color: #788a97;
}

#animation ul li > div:nth-child(2) {
    margin-top: 4px;
    width: 150px;
    height: 8px;
    background-color: #9db0ba;
}

/* Footer style */
footer {
    display: flex;
    justify-content: space-between;
    padding: 40px;
    border-top: 2px solid #586c7f;
}