html - Content not touching the sides of the screen -


i want have header in div, div isn't directly touching of page, there little bit of room on sides. why? , how can remove that? div just

<div class="header">     <img src="images/header.png" width="600" height="252" alt="header" /> </div>

and style.css file contains

.header {     background: url(../images/header_extend.png) repeat-x center;     overflow: hidden; } .header img {    display:block;    margin:0px auto;    max-width: 100%;    height: auto;    overflow: hidden; }

the header_extend.png fill rest of screen width.

you should remove default margin body tag.

body { margin:0 }

additionally, if want use percentage .header div's width, should specify parent's width well. in case parent body tag, can do:

body {      margin: 0;     width: 100%;  }

here's fiddle


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