CSS body width does not fill 100 percent

Might want to check if this might work, it did for my particular issue.

body {
    min-width: fit-content;
}

Added the answer of John Mcnulty as an paste because weblinks might go as 404. And this actually helped a bit to normalize the css without having browsers put their own css in it.

/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
    display: block;
}
body {
    line-height: 1;
}
ol, ul {
    list-style: none;
}
blockquote, q {
    quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
    content: '';
    content: none;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}

you need to use CSS reset:

use this code:

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

all element have some style in default you need to reset them.

try this

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

Ähm, your div.container has a width of 970px. And this breaks your body width because your layout isn't fluid. Use media queries or procentual widths will help a lot.

Though this is a very old issue, I have personally run into this thread twice without being able to resolve this issue (I keep forgetting what I did to fix it). For future viewers (me included) where setting padding and margin to 0 didn't magically fix your problem try "position: fixed" in the body.

body {
  position: fixed;
  overflow-y: scroll;
  padding: 0;
  margin: 0;
  width: 100%;
}

Maybe some clear:both; that are missing..

Up : It's probably not that, but maybe other sub-elements block width and does not allow the page to take its total width. If you have any float should think about making a clear before the footer (as I see a div on the right).

See your html / css code would be better :)

Ok so this worked for me:

    -webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;

My padding on sections of 100% was adding the padding to the page width resulting in width 100% + (padding value * 2)

Have you included a CSS reset in your page?

http://meyerweb.com/eric/tools/css/reset/

The issue persist only if you resized the Browser window. As its not breaking the website, You could leave that issue.

or

If you are creating a non-responsive site, You can do this simply by adding specific width to html and body. something like this

html, body {
  width:1170px;
}