Different colors when alternating colors is enabled for sukebei's g.css (#1454)

public/css/g.css

@@ -190,9 +190,12 @@ td.tr-le, .error-text {
     color: #7A5C94;
 }
 
-.sukebei tr:nth-child(2n+1) {
+.sukebei tr:nth-child(odd) {
     background: hsla(330, 100%, 91%, 0.2);
 }
+.sukebei .alt-colors tr:nth-child(odd) {
+    background: hsla(324, 60%, 85%, 0.2);
+}
 
 .sukebei .header .h-user button:focus {
     background-color: rgba(150, 100, 255, 0.16);