&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;meta charset=&quot;UTF-8&quot;&gt;
&lt;title&gt;classic html5 snake&lt;/title&gt;
&lt;style&gt;
body,html
{
margin:0;
padding:0;
}
#snake
{
margin:0;
padding:0;
width:100%;
height:auto;
}
&lt;/style&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;iframe  id=&quot;snake&quot; src=&quot;//classicsnake.neocities.org&quot;&gt;&lt;/iframe&gt;
&lt;/body&gt;
&lt;/html&gt;