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CSS

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HTML 

              
                <div class="grid">
  <div class="content"></div>
  <div class="full gradient">
    <div class="first-quarter" style="min-height: 240px"></div>
    <div class="three"></div>
   </div>
  <div class="inner-content">
    <div style="grid-column: three / span eleven"></div>
    <div style="grid-column: two / span six"></div>
    <div style="grid-column: six / span eight"></div>
    <div style="grid-column: eight / span ten"></div>
    <div style="grid-column: ten / span twelve"></div>
    <div style="grid-column: two / span five"></div>
    <div style="grid-column: five / span seven"></div>
    <div style="grid-column: seven / span ten"></div>
    <div style="grid-column: ten / span twelve"></div>
  </div>
  <div class="inner-content">
    <div style="grid-column: five / span nine"></div>
    <div style="grid-column: two / span four"></div>
    <div style="grid-column: four / span six"></div>
    <div style="grid-column: six / span eight"></div>
    <div style="grid-column: eight / span ten"></div>
    <div style="grid-column: ten / span twelve"></div>
  </div>
  <div class="first-third no-pad transparent">
    <img src="https://placehold.co/500x250" style="grid-column: first-third; width: 100%;" />
    <div class="first-third"></div>
    <div class="first-third double-height"></div>
    <div style="grid-column: four / span five"></div>
  </div>
  <div class="middle-third no-pad transparent">
    <img src="https://placehold.co/500x250" style="grid-column: middle-third; width: 100%;" />
    <div class="middle-third"></div>
    <div class="middle-third double-height"></div>
    <div style="grid-column: four / span five"></div>
  </div>
  <div class="last-third no-pad transparent">
    <img src="https://placehold.co/500x250" style="grid-column: last-third; width: 100%;" />
    <div class="last-third"></div>
    <div class="last-third double-height"></div>
    <div style="grid-column: four / span five"></div>
  </div>
  <div class="full gradient">
    <div class="triple-height" style="grid-column: two / span five"></div>
    <div class="triple-height" style="grid-column: seven / span twelve"></div>
   </div>
  <div class="full transparent no-pad">
    <img src="https://placehold.co/700x500" style="grid-column: full-start / span six; width: 100%;" />
    <div class="triple-height" style="grid-column: seven / span twelve"></div>
  </div>
  <div class="full transparent no-pad">
    <div class="triple-height" style="grid-column: two / span seven"></div>
    <img src="https://placehold.co/700x500" style="grid-column: eight / span full-end; width: 100%;" />
  </div>
  <div class="first-quarter"></div>
  <div class="second-quarter"></div>
  <div class="third-quarter"></div>
  <div class="fourth-quarter"></div>
</div>
!

CSS 

              
                * { margin: 0; padding: 0; }

body {
  margin-block: 24px;
}

div > div {
  display: grid;
  grid-template-columns: subgrid;
  min-height: 60px;
  padding: 24px;
  box-sizing: border-box;
  background: rgba(0,0,0,.2);
  gap: 24px;
}
div > div:not(.full) {
  border-radius: 4px;
}

.double-height {
  min-height: 120px;
}
.triple-height {
  min-height: 180px;
}

.gradient {
  background: linear-gradient(to right, #3AAB9A, #0060a9);
}

.transparent {
  background: transparent;
}

.no-pad {
  padding: 0;
}

.grid {
  display: grid;
  grid-template-columns:
    [full-start] 0.5fr
    [one content-start first-third-start first-quarter-start] 1fr
    [two inner-content-start] 1fr
    [three] 1fr
    [four first-quarter-end second-quarter-start] 1fr
    [five first-third-end middle-third-start] 1fr
    [six] 1fr
    [seven second-quarter-end third-quarter-start] 1fr
    [eight] 1fr
    [nine middle-third-end last-third-start] 1fr
    [ten third-quarter-end fourth-quarter-start] 1fr
    [eleven] 1fr
    [twelve inner-content-end] 1fr
    [last-third-end fourth-quarter-end content-end] 0.5fr
    [full-end];
  gap: 24px;
}

.content {
  grid-column: content;
}
.inner-content {
  grid-column: inner-content;
}
.full {
  grid-column: full;
}
.first-third {
  grid-column: first-third;
}
.first-two-thirds {
  grid-column: first-third / span middle-third-end;
}
.middle-third {
  grid-column: middle-third;
}
.last-third {
  grid-column: last-third;
}
.last-two-thirds {
  grid-column: middle-third / span last-third-end;
}
.first-quarter {
  grid-column: first-quarter;
}
.second-quarter {
  grid-column: second-quarter;
}
.third-quarter {
  grid-column: third-quarter;
}
.fourth-quarter {
  grid-column: fourth-quarter;
}
.one {
  grid-column: one;
}
.two {
  grid-column: two;
}
.three {
  grid-column: three;
}
.four {
  grid-column: four;
}
.five {
  grid-column: five;
}
.six {
  grid-column: six;
}
.seven {
  grid-column: seven;
}
.eight {
  grid-column: eight;
}
.nine {
  grid-column: nine;
}
.ten {
  grid-column: ten;
}
.eleven {
  grid-column: eleven;
}
.twelve {
  grid-column: twelve;
}
!

JS
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999px

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