[Grace Themes]

Hi,

To display responsive images in mobile devices

Add below css code in Appearance -> Editor -> style.css file

@media screen and (max-width:767px) {
.site-main img {
    width: 100% !important;
}
}

As you are using background image for your website and it is not possible to display responsive background image in your contact and other page

Regards
Grace Themes