Accessibility: Improve and modernize user interface controls. Make th…

…e select elements background white.

Props adhitya03.
See #47477.
Fixes #48128.


git-svn-id: https://develop.svn.wordpress.org/trunk@46337 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/css/forms.css

@@ -318,7 +318,7 @@ input[type="radio"].disabled:checked:before {
 	vertical-align: middle;
 	-webkit-appearance: none;
 	/* The SVG is arrow-down-alt2 from Dashicons. */
-	background: #f7f7f7 url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20width%3D%2220%22%20height%3D%2220%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Cpath%20d%3D%22M5%206l5%205%205-5%202%201-7%207-7-7%202-1z%22%20fill%3D%22%23555%22%2F%3E%3C%2Fsvg%3E') no-repeat right 4px top 50%;
+	background: #fff url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20width%3D%2220%22%20height%3D%2220%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Cpath%20d%3D%22M5%206l5%205%205-5%202%201-7%207-7-7%202-1z%22%20fill%3D%22%23555%22%2F%3E%3C%2Fsvg%3E') no-repeat right 4px top 50%;
 	background-size: 16px 16px;
 }