Add few CSS teaks

ui/static/css/common.css

@@ -425,6 +425,7 @@ a.button {
     border-color: var(--alert-error-border-color);
 }
 
+.alert-error h3,
 .alert-error a {
     color: var(--alert-error-color);
 }

ui/static/css/light.css

@@ -22,7 +22,7 @@
     --table-border-color: #ddd;
     --table-th-background: #fcfcfc;
     --table-th-color: #333;
-    --table-tr-hover-background-color: #a3a3a3;
+    --table-tr-hover-background-color: #f9f9f9;
     --table-tr-hover-color: #333;
 
     --button-primary-border-color: #3079ed;

ui/static/css/system.css

@@ -22,7 +22,7 @@
     --table-border-color: #ddd;
     --table-th-background: #fcfcfc;
     --table-th-color: #333;
-    --table-tr-hover-background-color: #a3a3a3;
+    --table-tr-hover-background-color: #f9f9f9;
     --table-tr-hover-color: #333;
 
     --button-primary-border-color: #3079ed;