/* Reset CSS */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html,
body {
}
img {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
  display: inline-block;
}

/* Main CSS */
.grid-wrapper > div {
  display: flex;
  justify-content: center;
  align-items: center;
}
.grid-wrapper > div > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 5px;
}

.grid-wrapper {
  padding-top: 15px;
  display: grid;
  grid-gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  grid-auto-rows: 250px;
  grid-auto-flow: dense;
}

.grid-wrapper .wide {
    grid-column: span 1;
  }
.grid-wrapper .tall {
    grid-row: span 2;
  }
.grid-wrapper .big {
    grid-column: span 1;
    grid-row: span 1;
  }

@media screen and (min-width: 768px)
{
  .grid-wrapper .wide {
      grid-column: span 2;
    }
    .grid-wrapper .tall {
      grid-row: span 2;
    }
    .grid-wrapper .big {
      grid-column: span 2;
      grid-row: span 2;
    }
}