Hi carlucci
It is declared in template.css file
div.ja-masthead {
background-image: url('../images/masthead.jpg');
background-position: center center;
background-color: #5c58dc;
background-blend-mode: multiply;
background-size: cover;
position: relative;
z-index: 1;
}
If you want to change it then override your image with the default one in folder /images
filename and dimensions should be the same.
Regards
