fieldset {
    border: 1px solid#ddd;
    padding: 5px 12px;
}

legend {
    font-size: 18px;
    padding: 0 10px;
    margin: auto;
}

.legend li:first-child::before {
    background-color: var(--color-disableAll);
}
.legend li:nth-child(2)::before {
    background-color: var(--color-highlight);
}
.legend li:nth-child(3)::before {
    background-color: var(--color-possibleNext);
}

.legend li::before {
    content: "";
    display: inline-block;
    vertical-align: middle;
    margin-inline-end: .5rem;
    border-width: 2px;
    border-style: solid;
    width: 1rem;
    height: 1rem;
    border-radius: 3px;
    border-color: #000;
}

.legend li {
    line-height: 1rem;
}
.legend {
    list-style: none;
    font-size: 0.8rem;
}