How to stretch one of several background images?

There is a block that has multiple background images. As one of them add a property cover?
<div class="back-img">
...
</div>

.back-img {
 background: url(1.png) no-repeat 0 0,
 url(2.jpg) no-repeat 50% 0,
 url(3.png) no-repeat 50% 100%,
 url(cover.png) no-repeat 50% 50%,
 url(4.png) no-repeat 100% 100%,
 url(5.jpg) no-repeat 50% 100%, #f5f5f5;
March 23rd 20 at 18:48
1 answer
March 23rd 20 at 18:50
Solution
url(cover.png) no-repeat 50% 50% / cover

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