Icons next to categories

/* For the left menu, we redefine the background of the element with the prefix-span class inside the category Audi */
.navigation-category [data-category-id="6"] .prefix-span {
  background: url("https://raw.githubusercontent.com/tima4502/car-icons/bb0d0fae3e5b66c512a27a130b219ec0ee342ada/audi.svg") center/contain no-repeat !important;
}

when i click on the main page the square icon appears again! can you tell me what i am doing wrong? and on the category page itself it works