* {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

.section-margin {
  margin: 48px 64px 136px;
  margin: 3rem 4rem 8.5rem;
}

h1 {
  font-family: 'Roboto Slab', sans-serif;
  font-size: 56px;
  line-height: 1;
  font-size: 3.5rem;
  line-height: 1;
  font-weight: 400;
  margin: 0;
  margin-bottom: 12.8px;
  margin-bottom: 0.8rem;
}

.grid-container {
  display: -ms-grid;
  display: grid;
  margin: 0 0 0 64px;
  margin: 0 0 0 4rem;
  padding: 32px;
  padding: 2rem;
  background-color: rgba(255, 0, 0, 0.5);
  -webkit-box-shadow: 2px 5px 10px rgba(0, 0, 0, .5);
          box-shadow: 2px 5px 10px rgba(0, 0, 0, .5);
}

.img-box {
  line-height: 0;
}

.img-box img {
    width: 100%;
  }

.fixed {
  -ms-grid-columns: (100px)[4];
      grid-template-columns: repeat(4, 100px);
  grid-gap: 4px;
  width: calc(412px + 4.4rem);
}

.fluid {
  -ms-grid-columns: (1fr)[6];
      grid-template-columns: repeat(6, 1fr);
  grid-gap: .5rem;
  max-width: 100%;
}

.responsive {
  -ms-grid-columns: (minmax(150px, 1fr))[auto-fit];
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  grid-gap: .5rem;
  max-width: 100%;
}

.explicitly {
  -ms-grid-columns: (1fr)[4];
      grid-template-columns: repeat(4, 1fr);
  max-width: 800px;
}

.explicitly .img-box:nth-child(1) {
  grid-column: 3 / 4;
  grid-row: 1 / 2;
}

.explicitly .img-box:nth-child(2) {
  grid-column: 1 / 2;
  grid-row: 2 / 3;
}

.explicitly .img-box:nth-child(3) {
  grid-column: 2 / 3;
  grid-row: 3 / 4;
}

.explicitly .img-box:nth-child(4) {
  grid-column: 1 / 2;
  grid-row: 4 / 5;
}

.explicitly .img-box:nth-child(5) {
  grid-column: 4 / 5;
  grid-row: 4 / 5;
}

.layering {
  -ms-grid-columns: 1fr 2fr 1fr 3fr 1fr 2fr 2fr;
      grid-template-columns: 1fr 2fr 1fr 3fr 1fr 2fr 2fr;
  max-width: 800px;
}

.layering .img-box:nth-child(1) {
  -ms-grid-column-span: 5;
  -ms-grid-column: 5;
  grid-column: 5 / span 5;
  grid-row: 1 / 4;
  z-index: 2;
}

.layering .img-box:nth-child(2) {
  -ms-grid-column-span: 4;
  -ms-grid-column: 3;
  grid-column: 3 / span 4;
  grid-row: 3 / 5;
  z-index: 1;
}

.layering .img-box:nth-child(3) {
  -ms-grid-column-span: 3;
  -ms-grid-column: 1;
  grid-column: 1 / span 3;
  grid-row: 4 / 7;
  z-index: 2;
}