main.css

main {
    max-width: 30rem;
    padding: 1rem;
    margin: auto;
}

h1 {
    margin: .5em;
}

#container {
    border: .15em solid black;
    border-radius: 1em;
    background: white;
    text-align: center;
    padding: .5em;
}

#message {
    padding-top: 5px;
}

.meta-info {
    margin:0.5em 1em; 
    text-align: center;
}

div .version {
    float: right; 
    font-size: 60%;
}

.nobreak {
    white-space: nowrap;
}

.meta-info > a {
    padding: 1em
}

/* Buttons */
.button {
    display: inline-block;
    margin: .25em;
    padding: .125em 1.5em;
    font-size: 150%;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    outline: none;
    color: #fff;
    background-color: #ccc;
    border: 1px solid #fff3;
    border-radius: .5em;
    box-shadow: 0 4px #999;
}

.ibutton {
    min-width: 80%;
}
.ibutton > .eval {
    font-size: 80%;
}
.interval-1 {
    color: #eee;
    background-color: #ee1111;
}
.interval-2 {
    color: #333;
    background-color: #ffc000;
}
.interval-3 {
    color: #eee;
    background-color: #843c0c;
}
.interval-4 {
    color: #333;
    background-color: #92cf50;
}
.interval-5 {
    color: #333;
    background-color: #00aff0;
}
.interval-6 {
    color: #eee;
    background-color: #bf0000;
}
.interval-7 {
    color: #333;
    background-color: #ff85ff;
}
.interval-8 {
    color: #eee;
    background-color: #008f00;
}
.interval-9 {
    color: #333;
    background-color: #00fa00;
}
.interval-10 {
    color: #eee;
    background-color: #0095fe;
}
.interval-11 {
    color: #ddd;
    background-color: #ff2f92;
}
.interval-12 {
    color: #eee;
    background-color: #9437ff;
}

.button:hover {
    filter: brightness(115%);
    border: 1px solid #777;
}

.button:active {
    box-shadow: 0 2px #888;
    transform: translateY(.125em);
}

.button:disabled {
    color: #ccc;
    background-color: #999;
}