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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              <div></div>
            
          
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CSS

            
              div {
  --shadow-margin: 5px;
  background: yellow;
  overflow: hidden;
  width: calc(200px + 2 * var(--shadow-margin));
  height: calc(100px + var(--shadow-margin));
}
div::before {
  /* Make sure the border is included in the size */
  box-sizing: border-box;
  /*
   * When the box is rotated, it should have width 200px.
   * That makes the length of one side of the box equal to:
   * 
   *    (200px / 2) / sin 45
   */
  --sin-45: 0.707106781;
  --square-side: calc(200px / 2 / var(--sin-45));
  width: var(--square-side);
  height: var(--square-side);
  /*
   * The rotated square will overshoot the left side
   * and need to be shifted in by:
   * 
   *   (200 - square side) / 2
   * 
   * But we also want to shift it in so that the box-shadow
   * is not clipped when we clip the parent so we add
   * a suitable margin for that.
   */
  --overhang: calc((200px - var(--square-side)) / 2);
  margin-left: calc(var(--overhang) + var(--shadow-margin));
  /* Finally, shift it up by half */
  margin-top: calc(var(--square-side) / -2);
  content: " ";
  display: inline-block;
  background: blue;
  border: 10px solid red;
  transform: rotate(45deg);
  box-shadow: 0 0 10px green;
}
            
          
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JS

            
              
            
          
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999px

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