html - header like facebook with fixed width -


hello expert trying build welcome page facebook. want header different color fixed width browser facebook welcome page. have created div id 100 width. width not fitting browser. showing in body. please tell me how this. absolutely new in of this.

index.html

<html> <head> <link rel="stylesheet" type="text/css" href="welcome.css"/> <title>welcome thinkers</title> </head> <body> <div class="header"><h1>welcome thinkers</h1></div> </body> </html>

css

body{     background-color:yellow;     width:100%;  } p{     font-size:23px;     color:#930 } .header{width:100%; height:72px; background-color:green;  }

if understand correctly think problem default margin/padding on elements.

if add 

body, h1 {   margin:0;    padding:0; }

it should sort out.

demo


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