<!DOCTYPE html>
<html>
<head>
<title>Calculator</title>
<style type="text/css">
button{
width: 100%;
}
</style>
</head>
<body>
<table border="1px">
<tr>
<td colspan="4" id="input">0</td>
</tr>
<tr>
<td colspan="3" ><button onclick="pushedButton(this)">AC</button></td>
<td><button onclick="pushedButton(this)">/</button></td>
</tr>
<tr>
<td><button onclick="pushedButton(this)">7</button></td>
<td><button onclick="pushedButton(this)">8</button></td>
<td><button onclick="pushedButton(this)">9</button></td>
<td><button onclick="pushedButton(this)">*</button></td>
</tr>
<tr>
<td><button onclick="pushedButton(this)">4</button></td>
<td><button onclick="pushedButton(this)">5</button></td>
<td><button onclick="pushedButton(this)">6</button></td>
<td><button onclick="pushedButton(this)">-</button></td>
</tr>
<tr>
<td><button onclick="pushedButton(this)">1</button></td>
<td><button onclick="pushedButton(this)">2</button></td>
<td><button onclick="pushedButton(this)">3</button></td>
<td><button onclick="pushedButton(this)">+</button></td>
</tr>
<tr>
<td colspan="2"><button onclick="pushedButton(this)">0</button></td>
<td><button onclick="pushedButton(this)">.</button></td>
<td><button onclick="pushedButton(this)">=</button></td>
</tr>
</table>
</body>
<script type="text/javascript" src="jquery-3.3.1.js"></script>
<script type="text/javascript" src="app.js"></script>
</html>