styles.css

/* Red borders on visible elements - handy for debugging */
/** { border: 1px solid red; }*/

:root {
    --bg-color: #223030;
    --text-color: black;
    --bg-image: url("assets/bg.jpg");
    --SHORTCUT_TIMEOUT: 1.5s;
}
body {
    padding: 0;
    margin: 0;

    background: var(--bg-image);
    background-color: var(--bg-color);
    background-size: cover;
    color: var(--text-color);

    font-family: 'Raleway', sans-serif;
    font-size: 22px;

    user-select: none;
    animation: fadein 1s;
}

#logo {
    padding-top: 10vh;
    text-align: center;
    color: white;
}
#logo h1 {
    font-weight: 200;
    font-size: 4rem;
    margin-bottom: 0;
}
#logo h2 {
    font-weight: 200;
    font-size: 2rem;
    margin-top: 0;
    opacity: 0.95;
}

#content {
    text-align: center;
}

#credits {
    /* Uncomment to hide credits from your local copy */
    /*display: none;*/
    position: absolute;
    font-size: 1rem;
    opacity: 0.5;
    bottom: 1rem;
    left: 1rem;
}

.group {
    display: inline-block;
    vertical-align: top;
    text-align: left;
    width: 20%;
    padding: .5% 1.5%;
    margin: .25%;
    background-color: rgba(255, 255, 255, 0.75);
    border-radius: 0.5em;
}
.group h1 {
    font-weight: 400;
    font-size: 2rem;
    margin-bottom: 0;
    border-bottom: 2px solid var(--text-color);
}

.group p {
    margin-bottom: 0;
    padding: 0.3rem 0;
}
.group p + p {
    margin: 0;
}

.subgroup {
    display: inline-block;
    vertical-align: top;
    text-align: left;
    width: 95%;
    margin: .25%;
    padding: .5% 1.5%;
}

.subgroup p {
    margin-top: 0;
    margin-bottom: 0;
    padding: 0.3rem 0;
}
.subgroup p + p {
    margin: 0;
}

.subgroup h2 {
    font-weight: 400;
    font-size: 1.5rem;
    margin-bottom: 0;
    border-bottom: 1px solid var(--text-color);
}

.shortcut {
    float: right;
    opacity: 0;
    animation: pulse var(--SHORTCUT_TIMEOUT);
}

a, a:hover {
    transition: all 0.4s ease;
}
a {
    padding: 0.3rem 0;
    color: var(--text-color);
    text-decoration: none;

    opacity: 0.5;
    padding-left: 0;
}
.group a:hover {
    opacity: 1;
    padding-left: 0.5rem;
}
#credits a:hover {
    opacity: 1;
}

@keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}
@keyframes pulse {
    0% { opacity: 0; }
    20% { opacity: 0.3; }
    80% { opacity: 0.3; }
    100%   { opacity: 0; }
}