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tenez collez ca dans votre custom css a la place de votre ancien code :

@media(min-width:1024px) {
body#index {
    Background-image: url('/themes/blck/assets/img/back1.jpg');
    background-position: top center; 
}
.d-block {
    background: #fdf3c9;
 }
 .img-fluid, .img-thumbnail {
    max-width: 1140px;
    margin: 0 auto;
    display: block;
}
.header-nav.u-bor-bot,.search-widget__btn {
    background: #16315E;
}
#_desktop_contact_link .u-link-body,.btn-group-sm > .btn, .btn-sm,.u-link-body,.shopping-cart {
    color: #fdf3c9;
}
.logo.img-fluid {
    width: 100%;
}
.search-widget__input-right,#top-menu {
    background: #fdf3c9;
}
.material-icons.search {
    color: #fff;
    font-weight: 700;
}
.header__right.header-top__col {
    padding: 8px;
    background: #16315e;
    width: auto;
 }
}

c'est pas exactement ca mais c'est cadeau