td.di-rare {background: #EEE} /* disfavoured */
td.di-invalid {background: #BBB} /* impossible */
+/* continents */
+td.c-af {background: #FFC}
+td.c-eu {background: #FDC}
+td.c-as {background: #FDD}
+td.c-oc {background: #EEDDF4}
+td.c-aa {background: #E3E8FF}
+td.c-sa {background: #DFF}
+td.c-na {background: #DFD}
+
/* hover effects */
td.di-d,
td.X:hover {cursor: help}