style.css

body,
html {
    height: 100%;
    margin: 0;
    background-color: lightyellow;
    color: #333;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 1.3em;
}

h1 {
    font-size: 1.5em;
    margin: 0;
}

ol {
    margin: 0;
}

p {
    font-size: 0.7em;
    font-style: italic;
}

li {
    padding: 4px;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
}

.centered {
    padding: 16px;
}

.disclaimer {
    padding: 4px;
    position: fixed;
    font-style: italic;
    bottom: 0;
    left: 0;
    right: 0;
    font-size: 0.5em;
    text-align: center;
}

.tooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px dotted black;
}

.tooltip-title {
    cursor: pointer;
}

.tooltip .tooltiptext {
    visibility: hidden;

    box-sizing: border-box;
    text-align: left;
    width: 350px;
    background-color: #555;
    color: #fff;
    border-radius: 6px;
    border:1px solid black;
    padding: 8px;
    box-shadow: black 1px 1px 2px;

    /* Position the tooltip */
    position: absolute;
    z-index: 1;
    bottom: 100%;
    left: 50%;
    margin-left: -175px;
    margin-bottom:4px;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
}

#version {
    margin-left: 16px;
    font-size: 30%;
    color: grey;
}

.github-fork-ribbon:before { background-color: #555 !important; }