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HTML

CSS

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HTML

              
                <div class="box">
  <div class="box_inner">
  <h3>エアメール風</h3>
    アイデアは良いかもしれないけど、いまいち使い道がないかもしれないボックスデザインです。どなたかエアメール的なコンテンツで使ってください。
  </div>
</div>
              
            
!

CSS

              
                .box{
  position: relative;
  background-image: linear-gradient(
    -45deg,
    #7480f7 6.25%, #fff 6.25%,
    #fff 12.5%, #f77480 12.5%,
    #f77480 18.75%, #fff 18.75%,
    #fff 25%, #7480f7 25%,
    #7480f7 31.25%, #fff 31.25%,
    #fff 37.5%, #f77480 37.5%,
    #f77480 43.75%, #fff 43.75%,
    #fff 50%, #7480f7 50%,
    #7480f7 56.25%, #fff 56.25%,
    #fff 62.5%, #f77480 62.5%,
    #f77480 68.75%, #fff 68.75%,
    #fff 75%, #7480f7 75%,
    #7480f7 81.25%, #fff 81.25%,
    #fff 87.5%, #f77480 87.5%,
    #f77480 93.75%, #fff 93.75%,
    #fff
  );
  background-size: 80px 80px;
  padding: 12px;
}
.box_inner{
  background: #FFF;
  padding: .5em;
}
h3{
  margin: 0 0 .5em;
}
              
            
!

JS

              
                
              
            
!
999px

Console