Inline swatches in explain lines

style.css

@@ -241,4 +241,4 @@ details.trials summary .label { font-weight: 650; }
 .grid td.small, .small { font-size: 12px; }
 .notes .why { display: block; color: var(--muted); font-weight: 500; }
 .why-line { margin: 6px 0 0; color: var(--muted); font-size: 14px; }
-.key .mx { display: inline-block; width: 14px; height: 8px; border-radius: 2px; vertical-align: 0; margin-right: 3px; }
+.key .mx, .explain-line .mx { display: inline-block; width: 14px; height: 8px; border-radius: 2px; vertical-align: 0; margin-right: 3px; }