Twenty Seventeen: Provide a background color fallback for non-webkit browsers on input styles

This allows the styles to work correctly when modified by high contrast computer setups.

Props presskopp.

Fixes #38939.


git-svn-id: https://develop.svn.wordpress.org/trunk@39388 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-content/themes/twentyseventeen/style.css

@@ -933,6 +933,7 @@ input[type="datetime-local"],
 input[type="color"],
 textarea {
 	color: #666;
+	background: #fff;
 	background-image: -webkit-linear-gradient(rgba(255, 255, 255, 0), rgba(255, 255, 255, 0));
 	border: 1px solid #bbb;
 	-webkit-border-radius: 3px;