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/* <div class="arrow-triangle"></div> */
.arrow-triangle
  {
      box-sizing: border-box;
      display: block;
      height: 50px;
      width: 50px;
    
      margin: 0 auto;

      border: 25px solid #000;
    
      border-left: 25px solid transparent;
      border-right: 25px solid transparent;
      border-bottom: 25px solid transparent;
  }