<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<body>
<p>Change the color in the input box:</p>
<div ng-app="" ng-init="usercolor='yellow'">
<input style="background-color:{{usercolor}}" ng-model="usercolor" value="{{usercolor}}">
</div>
</body>
</html>