* {
    box-sizing: border-box;
}

.hidden {
    display: none !important;
}

body {
    background-color: #eee;
}

#instructions {
    background-color: #ddd;
}

#instructions .current {
    background-color: yellow;
}

#die {
    background-color: #fde;
    border: 1px solid #aaa;
}

#die .value {
    text-align: center;
}

#nucleotide-selector {
    background-color: ivory;
    border: 1px solid black;
}

.genome.locked {
    cursor: text
}

.genome>ol {
    border: 1px solid black;
    background-color: white;
}

#nucleotide-selector,
.genome:not(.locked) {
    cursor: pointer;
}

#nucleotide-selector li:hover,
.genome:not(.locked) .nucleotide:hover {
    background-color: orange;
}

.genome .nucleotide.selected,
.genome:not(.locked) .nucleotide.selected:hover {
    background-color: red;
}