set color for form elements

src/popup/scss/base.scss

@@ -62,6 +62,10 @@ a {
     }
 }
 
+input, select, textarea {
+    color: $text-color;
+}
+
 input, select, textarea, button {
     font-size: $font-size-base;
     font-family: $font-family-sans-serif;