Hi Christopher and sorry for the delayed response,
If you want to hide the sidebar(widgets) from the mobile view you can add the following to your child theme:
`@media (max-width: 767px) {
#sidebar { display:none; }
}`
Depending of which header style you have selected in Visual Options a background image is shown in header.
If you want to disable this background image you can add this style in your child theme:
`header { background-image:none; }`