Make sure XML mode looks moderately okay in 'night' theme

theme/night.css

@@ -8,11 +8,11 @@
 
 .cm-s-night span.cm-comment { color: #6900a1; }
 .cm-s-night span.cm-atom { color: #845dc4; }
-.cm-s-night span.cm-number { color: #ffd500; }
+.cm-s-night span.cm-number, .cm-s-night span.cm-attribute { color: #ffd500; }
 .cm-s-night span.cm-keyword { color: #599eff; }
 .cm-s-night span.cm-string { color: #37f14a; }
 .cm-s-night span.cm-meta { color: #7678e2; }
-.cm-s-night span.cm-variable-2 { color: #99b2ff; }
+.cm-s-night span.cm-variable-2, .cm-s-night span.cm-tag { color: #99b2ff; }
 .cm-s-night span.cm-variable-3, .cm-s-night span.cm-def { white; }
 .cm-s-night span.cm-error { color: #9d1e15; }
 .cm-s-night span.cm-bracket { color: #8da6ce; }