clohr/menu-caret.html

## menu-caret.html
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
  <style>
    .arrow {
      top: 50px;
      display: block;
      position: relative;
      width: 300px;
      height: 150px;
      border: solid 1px #ddd;
      background: white;
      padding: 15px;
    }

    .arrow::before, .arrow::after {
      position: absolute;
      bottom: 100%;
      left: 10%;
      content: " ";
      width: 0px;
      height: 0px;
      border-left: 20px solid transparent;
      border-right: 20px solid transparent;
    }

    .arrow::before {
        border-bottom: 20px solid #333;
        z-index: 1;
    }

    .arrow::after {
        border-bottom: 20px solid white;
        z-index: 2
    }
  </style>
</head>
<body>

  <div class="arrow">This is some stuff.</div>

</body>
</html>