.l4 {background: #030} /* ascii */
.l5 {background: #00331D} /* ascii */
.l0 {background: #222}
-.ex {background: #222} /* disfavoured */
+.ex { color: #777} /* disfavoured */
.u-invalid {background: #333} /* impossible */
.p4::after {color: #F44}
.g0 a:hover, .g0[onclick]:hover {
color: #000; /* on default (light) background hover */
}
+.legend .ex:hover {background: #666}
.X:hover small {color: #FFF}