Use warning background color & primary text color for setting warnings

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

core/css/styles.scss

@@ -322,6 +322,8 @@ label.infield {
 	margin-top: 8px;
 	padding: 5px;
 	border-radius: var(--border-radius);
+	color: var(--color-primary-text);
+	background-color: var(--color-warning);
 }
 
 .warning {