body {
  background: #3c3939;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, 150px);
  grid-template-rows: repeat(3, 150px);
  gap: 10px;
  background: #3c3939;
  padding: 10px;
}

.box {
  background: white;
}

.red {
  background: #F44336;
}

.blue {
  background: #2DCBD1;
}

.tan {
  background: #D9B66F;
}

/* Positioning */
.red.left-large {
  grid-column: 1;
  grid-row: 1 / span 2;
}

.blue.top-wide {
  grid-column: 2 / span 2;
  grid-row: 1;
}

.tan.top-right {
  grid-column: 4;
  grid-row: 1;
}

.tan.middle-left {
  grid-column: 2;
  grid-row: 2;
}

.white.center {
  grid-column: 3;
  grid-row: 2;
}

.red.right-large {
  grid-column: 4;
  grid-row: 2 / span 2;
}

.white.bottom-left {
  grid-column: 1;
  grid-row: 3;
}

.red.bottom-mid {
  grid-column: 2 / span 2;
  grid-row: 3;
}

.blue.bottom-right {
  grid-column: 3;
  grid-row: 3;
}