<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>arrow icon</title>
</head>
<body>
  <div class="arrow-explain2"></div>
</body>
</html>
.arrow-explain2 {
  position: relative; /* 追加 */
  width: 60px;
  height: 20px;
  margin-right: 30px; /* 追加 */
  color: #0000cc;
  background: currentColor;
  top: 30px; /* 追加 */
}
.arrow-explain2:after {
  content: "";
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  left: 100%;
  width: 0;
  height: 0;
  border: 30px solid currentColor;
  border-top-color: transparent;
  border-right-color: transparent;
  border-right-width: 0;
  border-bottom-color: transparent;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.