Hi tphoenix5,
I have checked and see that you have some syntax error in the CSS code in the Custom CSS, I have added the following CSS code to the Systems > Site template styles > gk_storebox - Default > Advanced settings > Custom CSS:
@media only screen and (max-width: 580px) {
#gkHeaderNav a#gkLogo.cssLogo {
background: transparent url(/templates/gk_storebox/images/gavern-logo.png) no-repeat 0 0;
height: 50px;
width: 50px;
}
}
You can change the logo name here: gavern-logo.png.
Additionally, you haven't added the logo image to the templates/gk_storebox/images folder.