<!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>Document</title>
</head>
<body>
  <div class="hambuger_menu_icon"></div>
</body>
</html>
.hambuger_menu_icon {
  position: relative; /* 追加 */
  width: 60px;
  height: 2px;
  color: #000;
  background: currentColor;
  margin-top: 25px; /* 追加 */
}

.hambuger_menu_icon:before {
  content: "";
  position: absolute;
  top: -15px;
  width:  100%;
  height: 100%;
  background: currentColor;
}

External CSS

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External JavaScript

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