Untitled

<body>
    <div id="calculator">
<div id="screen">
    <p>69</p>
</div>
<div class="buttons">
<input type="button" value="1" id="1"/>
<input type="button" value="2" id="2" />
<input type="button" value="3" id="3" />
<input type="button" value="4" id="4" />
<input type="button" value="5" id="5" />
<input type="button" value="6" id="6" />
<input type="button" value="7" id="7" />
<input type="button" value="8" id="8" />
<input type="button" value="9" id="9" />
<input type="button" value="+" id="plus"/>
<input type="button" value="-" id="subtract"/>
<input type="button" value="*" id="multiplication"/>
<input type="button" value="/" id="divide"/>
<input type="button" value="=" id="equals" />
<input type="button" value="C" id="C" />
</div>
</div>