html body.material .icon-salient-cart {
    background-image: url(https://www.asanonbeliever.com/wp-content/themes/Salient-UK/dist/images/cart.svg) !important;
}

html body.material .icon-salient-search {
    background-image: url(https://www.asanonbeliever.com/wp-content/themes/Salient-UK/dist/images/search.svg) !important;
}