Responsive image mosaic

Creates a responsive image mosaic.

• Use display: grid to create an appropriate responsive grid layout.
• Use grid-row: span 2 / auto and grid-column: span 2 / auto to create items that span two rows or two columns respectively.
• Wrap the previous styles into a media query to avoid applying on small screen sizes.

<div class="image-mosaic">
  <div
    class="card card-tall card-wide"
    style="background-image: url('https://picsum.photos/id/564/1200/800')"
  ></div>
  <div
    class="card card-tall"
    style="background-image: url('https://picsum.photos/id/566/800/530')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://picsum.photos/id/575/800/530')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://picsum.photos/id/626/800/530')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://picsum.photos/id/667/800/530')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://picsum.photos/id/678/800/530')"
  ></div>
  <div
    class="card card-wide"
    style="background-image: url('https://picsum.photos/id/695/800/530')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://picsum.photos/id/683/800/530')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://picsum.photos/id/693/800/530')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://picsum.photos/id/715/800/530')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://picsum.photos/id/610/800/530')"
  ></div>
  <div
    class="card"
    style="background-image: url('https://picsum.photos/id/599/800/530')"
  ></div>
</div>

.image-mosaic {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  grid-auto-rows: 240px;
}

.card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: #353535;
  font-size: 3rem;
  color: #fff;
  box-shadow: rgba(3, 8, 20, 0.1) 0px 0.15rem 0.5rem, rgba(2, 8, 20, 0.1) 0px 0.075rem 0.175rem;
  height: 100%;
  width: 100%;
  border-radius: 4px;
  transition: all 500ms;
  overflow: hidden;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  padding: 0;
  margin: 0;
}

@media screen and (min-width: 600px) {
  .card-tall {
    grid-row: span 2 / auto;
  }

  .card-wide {
    grid-column: span 2 / auto;
  }
}