boxes with dividers

by Richard Hunter

HTML

<div class="container">
   <div class="a">
      <div class="b">b</div>
      <div class="b">b</div>
      <div class="b">b</div>
      <div class="b">b</div>
      <div class="b">b</div>
      <div class="b">b</div>
      <div class="b">b</div>
      <div class="b">b</div>
      <div class="b">b</div>
      <div class="b">b</div>
      <div class="b">b</div>
      <div class="b">b</div>
      <div class="b">b</div>
      <div class="b">b</div>
      <div class="b">b</div>
    </div>
    </div>

CSS

html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

.container {
  --divider: 2px;
  --column-gap: 20px;
  --border: 2px;
  background: pink;
  overflow: hidden;
}

.a {
  display: flex;
  flex-wrap: wrap;

  justify-content: flex-start;
  background: lightblue;
  margin-left: calc(var(--column-gap) / -2);
}

.b {
  background-color: #F6E0E0;
  width: 105px;
  border: solid var(--border) black;
  height: 80px;
  text-align: center;
  line-height: 80px;
  color: grey;
  position: relative;
  margin-bottom: 4px;
  margin-left: calc(var(--column-gap) / 2);
  margin-right: calc(var(--column-gap) / 2);
}

.b:after {
  content: '';
  position: absolute;
  right: 100%;
  top: 50%;
  display: inline-block;
  width: var(--divider);
  height: 50px;
  background-color: coral;
  transform: translateY(-50%);
  margin-right: calc(((var(--column-gap) - var(--divider)) / 2) + var(--border));
}