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HTML

              
                <head>
  <meta name="robots" content="noindex,nofollow">
  <meta name="viewport" content="width=device-width,initial-scale=1.0">
  <!--==============レイアウトを制御する独自のCSSを読み込み===============-->
  <link rel="stylesheet" type="text/css" href="https://dl.dropbox.com/s/saz7ehm66llopzw/reset.css?dl=0">
</head>

<body>

  <p class="lead">マウスポインタをメニューの上に持ってきて</p>
  <ul class="gnavi">
    <li class="current"><a href="#">Home</a></li>
    <li><a href="#">About</a></li>
    <li><a href="#">Service</a></li>
    <li><a href="#">Contact</a></li>
  </ul>

</body>
              
            
!

CSS

              
                @charset "utf-8";

/*==================================================
共通 横並びのための設定
===================================*/

.gnavi {
  display: flex;
  flex-wrap: wrap; /*スマホ表示折り返し用なのでPCのみなら不要*/
  margin: 0 0 50px 0;
  list-style: none;
}

.gnavi li a {
  display: block;
  padding: 10px 30px;
  text-decoration: none;
  color: rgba(125, 89, 252, 1);
}

.gnavi li {
  margin-bottom: 20px;
}

/*==================================================
 左から右に線が伸びる(上部)
===================================*/
.gnavi li a {
  /*線の基点とするためrelativeを指定*/
  position: relative;
}

.gnavi li.current a,
.gnavi li a:hover {
  color: rgba(125, 89, 252, 1);
}

.gnavi li a::after {
  content: "";
  /*絶対配置で線の位置を決める*/
  position: absolute;
  /* 「bottom: 100%;」でも同じ */
  top: 0;
  left: 10%;
  /*線の形状*/
  width: 80%;
  height: 2px;
  background: linear-gradient(
    109.6deg,
    rgba(253, 199, 141, 1) 11.3%,
    rgba(249, 143, 253, 1) 100.2%
  );
  /*アニメーションの指定*/
  transition: all 0.3s;
  transform: scale(0, 1); /*X方向0、Y方向1*/
  transform-origin: left top; /*左上基点*/
}

/*現在地の形状の設定*/
.gnavi li.current a::after {
  transform: scale(0.2, 1); /*X方向に0.2スケール拡大*/
}

/*現在地を含むhoverの設定*/
.gnavi li.current a:hover::after,
.gnavi li a:hover::after {
  transform: scale(1, 1); /*X方向にスケール拡大*/
}

/*========= レイアウトのためのCSS ===============*/

.lead {
  padding: 30px 20px;
}

              
            
!

JS

              
                
              
            
!
999px

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