You can add 2 types of image to a header background:

1. Website wide

This is as wide as the monitor screen. The ideal dimensions for this image are: 2gkatsanos [11:55 Agkatsanos [11: 56000 pixels wide at 127 pixels high.

An example:

2. Page wide

In this case, the image is as wide as the margins of the website. Here are the ideal dimensions: 1140 pixels wide and 127 pixels high.

Should the image be larger, it will be automatically reset.