Here’s the steps to make your WordPress default (Kubrick) theme wider.
For me I made it 200 pixels wider.
So for functions.php
add 200
to each of the highlighted rows
![functions.php functions.php](/blog/static/72b5b5e8/functions_php@2x.png)
In rtl.css
add 200
also
![rtl.css rtl.css](/blog/static/c8c0ed09/rtl_css@2x.png)
In style.css
add 200
to all but the #commentform input
which I added only 100
![style.css 1 style.css 1](/blog/static/9301c0b1/style_css_1@1x.png)
![style.css 2 style.css 2](/blog/static/a941e98d/style_css_2@2x.png)
Then images\\header-img.php
add 200
to each value
![header-img_php header-img_php](/blog/static/b5742bcf/header-img_php@2x.png)
Lastly make the following pictures 200
pixels wider images\\kubrickbgwide.jpg
, images\\kubrickfooter.jpg
and images\\kubrickheader.jpg
I did this in Paint.Net by creating a new picture the same size as each one, pasting in the picture left justified then cutting from the source image the right 60% of the image and pasting that over the right edge of the picture giving a wider final picture.
Zoom helped for aligning the pictures. Also be careful when you export the pictures as the compression settings have a lot of effect of size of the images.