Main Image on Site Doesn't Fill Side to Side on Mobile Phone

I’ve noticed that the main image at the top of the page at doesn’t fully stretch from side to side when looking at it on a phone. Is there a way to fix that? Thank you.

Hello there,

Try adding this CSS code to Appearance > Customize > Additional CSS from dashboard.

    @media only screen and (max-width: 780px) {
      #pg-5053-0 .panel-grid-cell {
        padding-left: 0px !important;
        padding-right: 0px !important;