<div class="gallery">
  <img src="https://picsum.photos/id/1040/300/300" alt="a house on a mountain">
  <img src="https://picsum.photos/id/106/300/300" alt="sime pink flowers">
  <img src="https://picsum.photos/id/136/300/300" alt="big rocks with some trees">
  <img src="https://picsum.photos/id/1039/300/300" alt="a waterfall, a lot of tree and a great view from the sky">
  <img src="https://picsum.photos/id/110/300/300" alt="a cool landscape">
  <img src="https://picsum.photos/id/1047/300/300" alt="inside a town between two big buildings">
  <img src="https://picsum.photos/id/1057/300/300" alt="a great view of the sea above the mountain">
</div>
.gallery {
  --s: 150px; /* control the size */
  --g: 10px;  /* control the gap */
  display: grid;
}

.gallery > img {
  grid-area: 1/1;
  width: var(--s);
  aspect-ratio: 1.15;
  object-fit: cover;
  clip-path: polygon(25% 0%, 75% 0%, 100% 50%,75% 100%,25% 100%,0 50%);
}



body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-content: center;
  background: #aabbfb;
}
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