[Grace Themes]

Hi Pascale

You can use the custom header image by making some changes in custom-header.php file

Go to the Appearance -> Editor -> custom-header.php

at line no. 38 find .innerbanner123 and replace with .header

.header{
    background: url(<?php echo get_header_image(); ?>) no-repeat #111;
    background-position: center top;
 }

Regards
Grace Themes