<div class="box1">
  <p>
    Duis pharetra mollis neque ut commodo. Nullam nec lacus non est porta auctor ut quis ipsum. Integer quis pharetra enim, ac vestibulum justo. 
  </p>
</div>
<div class="box2">
  <p>
    Nam quis venenatis velit. Mauris in tincidunt nulla. Aenean eu pellentesque lorem. Aenean ut gravida neque. Praesent eleifend, lacus nec ultrices convallis, lectus urna vulputate diam, id feugiat magna tortor ut erat. 
  </p>
</div>
<div class="box3">
  <p>
    Maecenas vitae ligula dignissim, suscipit elit a, interdum neque. Nunc dignissim odio eget vulputate aliquam. Aenean varius leo sapien, nec semper erat hendrerit sit amet.
  </p>
</div>
body {
  color: #333;
  font: 18px/1.6 sans-serif;
  background: #333;
}
p {
  width: 70%;
  margin: 0 auto;
  padding: 40px 0;
}
.box1,
.box3{
  color: #888;
}

/* 斜め配置 */
.box2 {
  -webkit-clip-path: polygon(0 0, 100% 30%, 100% 70%, 0 100%);
  clip-path: polygon(0 0, 100% 30%, 100% 70%, 0 100%);
  background: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/85188/bg-red.jpg);
  padding: 40px 0;
}
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