graph-theory.css

.working-out {
    --num-columns: 1;
    display: grid;
    grid-template-columns: repeat(var(--num-columns),auto);
    grid-gap: 1em;
    align-items: center;
    justify-content: start;
}
.working-out .explanation {
    grid-column: 1;
}
@media (max-width: 40em) {
    .working-out {
        grid-template-columns: 1fr;
    }
}


.weight-matrix {
    border-collapse: collapse;
}

.weight-matrix td,
.weight-matrix th {
    padding: 0.25em;
}
.weight-matrix td {
    text-align: right;
}

.weight-matrix tr > *:not(:last-child) {
    border-right: 1px solid;
}
.weight-matrix tr:not(:last-child) > * {
    border-bottom: 1px solid;
}

.working-out table th.visited,
.weight-matrix td.visited {
    font-weight: bold;
    text-decoration: underline;
}

.weight-matrix td.possible {
    background: hsl(240,50%,90%);
}
.weight-matrix td.connected {
    opacity: 0.5;
}
.working-out table {
    margin: 0 auto;
}