In this tutorial, I am talking about page banner section.  Banner section background color depend on your theme color. If you not liked background color? You can add background image. Now, I will explain you. How to change add banner image?

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1. Can I add Banner Image for All Pages?

Yes of course, You can add image using Css. Follows this step.

.page-title-section{
background:url('your image path');
}

Go to => WP-Menu => Appearance => Customize => Header Settings => Custom CSS

As you can see above the code. You need to enter this code in CSS Snippet, then Save & Publish. Refer attach screen shot

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2. Can I add Banner image on Specific Pages?

Yes of course, You can add image using Css. Follows this step.

.page-id-(your page id) .page-title-section{
background:url('your image path') !important;
}
For Example.
.page-id-43 .page-title-section{
background:url('your image path') !important;
}

Go to => WP-Menu => Appearance => Customize => Header Settings => Custom CSS

As you can see above code. You need to enter this code in CSS Snippet, then Save & Publish. Refer attach screenshot

appt-67-new