.button {
    user-select: none;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 24px;
    padding: 8px;
    border-radius: 4px;
    border: solid 1px var(--mono-7f);
    color: var(--gold-5f);
    background-color: var(--mono-5f);
    text-shadow: 0 0 4px var(--mono-3f);
    box-shadow: 0 0 4px var(--mono-3f);
    transition: 0.1s;
}
.button:hover {
    border: solid 1px var(--mono-7f);
    color: var(--gold-5f);
    background-color: var(--mono-3f);
    text-shadow: 0 0 0 transparent;
    box-shadow: 0 0 8px var(--mono-3f);
    transition: 0.1s;
}
.button.hide {
    padding: 0;
    border: solid 1px transparent;
    color: transparent;
    background-color: transparent;
    text-shadow: 0 0 0 transparent;
    box-shadow: 0 0 0 transparent;
    transition: 0.1s;
}

#content > .control {
    position: fixed;
    display: flex;
    justify-content: center;
    bottom: 0;
    width: 100%;
    margin-bottom: 96px;
}
#content > .control > .button {
    width: 32px;
    height: 32px;
    margin: 0 8px;
    font-size: 24px;
}
#content > .control > .button.short {
    width: 16px;
}
#content > .control > .button.long {
    width: 64px;
}