Hello,
1/ Change this code https://prnt.sc/26p5t57 to
.category-grid .categories-mask:hover {
box-shadow: 0 3px 7px rgb(0 0 0 / 8%);
}
2/ Check the background on this demo page – https://xstore.8theme.com/demos/2/artmaxy/contact-us/ , it depends on the length of the page content. Background settings you can change via Theme Options > Styling
3/ Add this code in Theme Options > Theme custom CSS:
.sidebar-position-without .row-count-3 .product:nth-child(3n+1) {
clear: none;
}
Regards