Update color

jet/static/jet/css/themes/light-violet/_variables.scss

@@ -15,7 +15,7 @@ $error-text-color: #c7254e;
 $link-color: #79A7D8;
 $hover-link-color: #1cacfc;
 
-$contrast-color: #B486CB;
+$contrast-color: #A464C4;
 
 @import url(https://fonts.googleapis.com/css?family=Source+Sans+Pro);