How to stretch the contents of the web page to its full extent without margin?

This is because the default margin has some values set when we create a web page. so set the margin to 0 to 
stretch your page content to the full extent of the web page using the CSS.


<style type="text/css">
body {
 margin-top: 0px;
 margin-right: 0px;
 margin-bottom: 0px;
 margin-left: 0px
}
</style>


Or even simplied as

<style type="text/css">

body {

 margin : 0px;

}