Puzzle Position

HTML

<div class="puzzle">
  <div class="puzzle-piece"><img src="https://i.ibb.co/f4cGc1x/Puzzle-einzeln-hell.png"></div>
  <div class="puzzle-piece"><img src="https://i.ibb.co/f4cGc1x/Puzzle-einzeln-hell.png"></div>
  <div class="puzzle-piece"><img src="https://i.ibb.co/f4cGc1x/Puzzle-einzeln-hell.png"></div>
  <div class="puzzle-piece"><img src="https://i.ibb.co/yB4FFgX/Puzzle-einzeln-dunkel.png"></div>
  <div class="puzzle-piece"><img src="https://i.ibb.co/yB4FFgX/Puzzle-einzeln-dunkel.png"></div>
  <div class="puzzle-piece"><img src="https://i.ibb.co/yB4FFgX/Puzzle-einzeln-dunkel.png"></div>
  <div class="puzzle-piece"><img src="https://i.ibb.co/f4cGc1x/Puzzle-einzeln-hell.png"></div>
  <div class="puzzle-piece"><img src="https://i.ibb.co/f4cGc1x/Puzzle-einzeln-hell.png"></div>
  <div class="puzzle-piece"><img src="https://i.ibb.co/f4cGc1x/Puzzle-einzeln-hell.png"></div>
</div>

CSS

.puzzle{
  display:flex;
  flex-flow:row wrap;
  height:100%;
}
.puzzle-piece{
  position:relative;
  flex-basis:33%;
  width:33%;
  height:33%;
}
.puzzle-piece img{
  display:block;
  width:100%;
  height:auto;
}