The background image can be changed through the style.css sheet. You can access this via FTP or in WordPress under “Appearance > Editor”.
You’ll be looking for this code:
/* IMAGE MOBILE MENU BACKGROUND */
body #page-container .et_slide_in_menu_container {
background-image: url(‘http://anthem.artillerymedia.co/wp-content/uploads/2016/08/menuGradient2BG.jpg’) !important;
background-size: cover !important;
background-position: center !important;
}
.et_header_style_fullscreen .et_slide_in_menu_container.et_pb_fullscreen_menu_opened {
opacity: 1;
}
Upload the image you’d like to use instead to your WordPress media library and copy the URL. Then replace the URL in the style.css sheet with the new URL.
Clear your cache and hard refresh.