This call to action button uses ‘.btn-secondary’ class with in your stylesheet. For example, if you are using ‘New Orleans’ colour Palette, your style sheet is wp-content -> themes -> Tyler -> css -> schemes -> new-orleans ->layout.css
There is a simple way to change the background of the call to action button with out changing the default style.
Please follow the instruction below:
1) Please don’t forget to take a backup of the file prior to any change.
2) Open wp-content ->themes ->Tyler -> css ->layout.css via FTP or Cpanel
3) Add the following style at the end of the page.
#tile_calltoaction a.btn.btn-lg.btn-secondary { background-image:url(‘your image path’)}
4) Update the file to the server