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HTML 

              
                <div class="single sample"></div>
<div class="double sample">
  <strong>pattern</strong>
</div>

<div class="zigzag-pattern sample">
  <strong>zigzag pattern</strong>
</div>

<div class="zigzag-pattern fromtop">
  <strong style="color: white">zigzag from top</strong>
</div>

<div class="orange zigzag-pattern onleft">
  <h5>From the left</h5>
</div>

<div class="orange zigzag-pattern onright">
  <h5>From the right</h5>
</div>

<div class="orange zigzag-pattern fromtwoends">
  <strong>from two ends</strong>
</div>

<div class="orange zigzag-pattern fromtwoends swapaxis">
  <strong>from two ends with swapped axis</strong>
</div>

<div class="grey zigzag-pattern">
  <h3>dark block</h3>
</div>
!

CSS 

              
                .sample {
  box-shadow: 0 0 1px 1px #000;
  margin: 30px;
}

.single {
  width: 200px;
  height: 200px;
  background-image: linear-gradient(-45deg, black 100px, transparent 100px);
}

.double {
  /* make wide */
  width: 100%;
  height: 200px;

  /* two triangles */
  background-image: linear-gradient(-45deg, black 100px, transparent 100px),
    linear-gradient(45deg, black 100px, transparent 100px);

  /* contain size to double 140px */
  background-size: 280px;

  /* tighten loose ends */
  background-position: bottom left;
  background-repeat: repeat-x;
}

:root {
  --zigzagbase: 200px;
  --color: black;
}
.zigzag-pattern {
  /* at 70% of size, set height of triangle */
  --zigzag-height: calc(var(--zigzagbase) * 0.7);

  /* gradient at half size stop */
  --zigzag-stop: calc(var(--zigzagbase) / 2);

  /* make background size double the height to create the pattern */
  --zigzag-size: calc(var(--zigzagbase) * 1.4);

  /* min-height to contain the zigzag at all times */
  min-height: var(--zigzag-height);

  background-image: linear-gradient(
      -45deg,
      var(--color) var(--zigzag-stop),
      transparent var(--zigzag-stop)
    ),
    linear-gradient(
      45deg,
      var(--color) var(--zigzag-stop),
      transparent var(--zigzag-stop)
    );

  background-size: var(--zigzag-size);
  background-position: bottom left;
  background-repeat: repeat-x;
}

.fromtop {
  background-image: linear-gradient(
      -135deg,
      var(--color) var(--zigzag-stop),
      transparent var(--zigzag-stop)
    ),
    linear-gradient(
      135deg,
      var(--color) var(--zigzag-stop),
      transparent var(--zigzag-stop)
    );
}

.onleft {
  /* swap x and y axis */
  background-size: 100% var(--zigzag-size);
  background-position: top right;
  background-repeat: repeat-y;

  /* angles on the right half of the circle */
  background-image: linear-gradient(
      -135deg,
      var(--color) var(--zigzag-stop),
      transparent var(--zigzag-stop)
    ),
    linear-gradient(
      -45deg,
      var(--color) var(--zigzag-stop),
      transparent var(--zigzag-stop)
    );
}
.onright {
  background-size: 100% var(--zigzag-size);
  background-position: top right;
  background-repeat: repeat-y;

  /* angles are on left half of the circle */
  background-image: linear-gradient(
      135deg,
      var(--color) var(--zigzag-stop),
      transparent var(--zigzag-stop)
    ),
    linear-gradient(
      45deg,
      var(--color) var(--zigzag-stop),
      transparent var(--zigzag-stop)
    );
}

.fromtwoends {
  /* include all four angles */

  background-image: linear-gradient(
      -45deg,
      var(--color) var(--zigzag-stop),
      transparent var(--zigzag-stop)
    ),
    linear-gradient(
      45deg,
      var(--color) var(--zigzag-stop),
      transparent var(--zigzag-stop)
    ),
    linear-gradient(
      -135deg,
      var(--color) var(--zigzag-stop),
      transparent var(--zigzag-stop)
    ),
    linear-gradient(
      135deg,
      var(--color) var(--zigzag-stop),
      transparent var(--zigzag-stop)
    );
}

.swapaxis {
  /* swap x and y axis */
  background-size: 100% var(--zigzag-size);
  background-position: top right;
  background-repeat: repeat-y;
}

.orange {
  --zigzagbase: 20px;
  --color: white; /* the body bg color */

  background-color: orange;
  margin: 10px;
  padding: 30px;
}

.grey {
  --zigzagbase: 17px;
  --color: white; /* the body bg color */

  background-color: #333;
  color: #fff;
  margin: 10px;
  padding: 30px;
}
!

JS
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