html, body {
    font-family: 'Roboto', sans-serif;
    font-size: 17px;
    background-color: #383838;
    color: #c5c5c5;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0;
    margin: 0;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

body {
    background: linear-gradient(-45deg, #282828, #191919, #383838, #313034);
    background-size: 400% 400%;
    animation: gradient 15s ease infinite;
    height: 100vh;
    padding: 0;
    margin: 0;
}

ul {
    line-height: 1.5em;
}

a {
    color: #60a2ec;
    text-decoration: none;
    cursor: pointer;
}

a:hover, a:focus {
    color: #f7b44b;
    outline: none;
}

h1 {
    color: white;
}

h3 {
    color: white;
    background-color: #282828;
}

h2 {
    margin-block-end: 0.7em;
}

.contents {
    margin: 50px 40px;
}

.contents__group {
    margin-bottom: 40px;
}

.download-button {
    display: inline-block;
    height: calc(4.75em + 2px);
    padding: 0 3.75em;
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 0.7em;
    margin: 0 0;
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.75em;
    align-content: center;
    letter-spacing: 0.25em;
    cursor: pointer;
    text-transform: uppercase;
    white-space: nowrap;
    transition: background-color 0.1s;
}

.download-button:hover {
    border-color: white;
    color: white;
    background-color: rgba(255, 255, 255, 0.2);
    transition: background-color 0.2s;
}

hr {
    border-width: 1px 0 0 0;
    border-color: rgba(255, 255, 255, 0.5);
    margin-inline-start: 0;
    max-width: 700px;
}

.li {
    margin-top: 0.1em;
}

img.emoji {
    height: 1em;
    width: 1em;
    margin: 0 .05em 0 .1em;
    vertical-align: -0.1em;
}

.cats {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    margin: auto;
}

.cats > img {
    object-fit: contain;
    max-width: 100px;
    margin: 5px;
    border-radius: 50px;
}