Theme Changer Through angular js 

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Source Code - 

<!DOCTYPE html>
<html ng-app="">
<head>
    <title>Color Changer</title>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.8.2/angular.min.js"></script>
</head>
<body bgcolor="{{ (choice=='Black') ? 'black' : 'white' }}"
      text="{{ (choice=='Black') ? 'white' : 'black' }}">
    Themes:
    Light <input type="radio" name="c" value="white" ng-model="choice">
    Dark <input type="radio" name="c" value="Black" ng-model="choice">
    <br><br>
    <H1 align="center">Welcome to my Website</H1>
    <p align="center">This simple dummy Website </p>
</body>
</html>