android webview highlight color when input field in clicked

Hi, I'm looking for a way to disable the highlight color in webviews when a field is selected. At default it gives me a greenish overlay for a moment before focussing. Normally (in mobile browsers) this is prevented by applying some CSS to the field (or just everything).

* {
     -webkit-tap-highlight-color: rgba(255,255,255,0) !important;
}

The css however seems to be overridden by Titanium or Android webviews, because it does not seem to work. Does anybody know if there is a setting for this? or if there is a other solution to this problem? thanks