function fAlert(str){ alert(str); }
<style type="text/css">
pre.cls_pre {
margin:1em 0; padding:10px;
background-color:#000;
color:lime;
font-family:monospace;
line-height:1.22;
overflow:scroll;
}
</style>
<pre class="cls_pre">function fAlert(str){
alert(str);
}</pre>