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<!doctype html>
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<title>Example</title>
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<style>
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.grid {
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  display: grid;
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  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));;
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  grid-gap: 10px;
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  align-items: start;
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  justify-items: center;
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  margin: auto;
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  width: 540px;
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  }
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.grid img {
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  border: 1px solid rgba(0,0,0,0.3);
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  box-shadow: 2px 2px 6px 0px rgba(0,0,0,0.3);
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  max-width: 100%;
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}
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.grid img:nth-child(6) {
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  grid-column: span 5;
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  }
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</style>
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<main class="grid">
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  <img src="/pix/samples/22m.jpg" alt="Sample photo">
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  <img src="/pix/samples/23m.jpg" alt="Sample photo">
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  <img src="/pix/samples/24m.jpg" alt="Sample photo">
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  <img src="/pix/samples/25m.jpg" alt="Sample photo">
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  <img src="/pix/samples/15m.jpg" alt="Sample photo">
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  <img src="/pix/samples/17l.jpg" alt="Sample photo">
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  <img src="/pix/samples/27m.jpg" alt="Sample photo">
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  <img src="/pix/samples/28m.jpg" alt="Sample photo">
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  <img src="/pix/samples/26m.jpg" alt="Sample photo">
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  <img src="/pix/samples/30m.jpg" alt="Sample photo">
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  <img src="/pix/samples/31m.jpg" alt="Sample photo">
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</main>