Proportional logo in header area

Hi all,

I am using WP version 4.7.4 and Atahualpa version 3.7.24.
The site is: http://www.concisa.net.ve/2017

In the header area, I have a logo image (%logo). It is a unique bitmap image made of several logos. When I reduce the width of the browser, the logo image maintains its size. It is not reduced proportionally according to the width of the browser. However, the slider image does.

I am attaching the exported settings of the site and a screenshot where I highlight the problem.

Thank you for advising.

Eric.