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                <div class="container">
<!-- CSS Pseudo Class :after, :before -->
  <h2>CSS Pseudo Class</h2>
  <div class="overlay">Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.</div>
  <span>You can see in above container named "overlay". We have given overlay at same div using ":before" and using ":after" I have created "Triangle" which is denoting to this comment.</span>


                /* CSS Pseudo Class :after, :before */
  position: relative;
  height: 100%;
  padding: 20px;
  border: 2px solid;
.overlay::before { 
  display: block; 
  height: 100%; 
  position: absolute; 
  top: 0; 
  left: 0; 
  width: 100%; 
  z-index: 1; 
  background-color: rgba(255, 31, 31, 0.28); 
.overlay:after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 10px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 12px 10px 0 10px;
  border-color: #ff5959 transparent transparent transparent;