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HTML

              
                <head>
  <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://assets.codepen.io/6329135/reset.css">
</head>

<body>
  <div class="btn-position">
    <a href="#" class="btnchangeline"><span>塗りから線に変わる</span></a>
  </div>
</body>
              
            
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CSS

              
                @charset "utf-8";

/*塗りから線に変わる*/
.btnchangeline {
  display: inline-block;
  color: #333;
  padding: 10px 30px;
  margin: 20px 0;
  text-decoration: none;
  outline: none;
  font-size: max(14px, 2vw);
  white-space: nowrap;
  width: max(180px, 40vw);

  /*線の基点とするためrelativeを指定*/
  position: relative;
  /*アニメーションの指定*/
  transition: all 0.3s ease-in-out;
}

/*線の設定*/
.btnchangeline::before {
  content: "";
  /*絶対配置で線の位置を決める*/
  position: absolute;
  bottom: 0;
  left: 0;
  z-index: 1;
  /*線の形状*/
  width: 100%;
  height: 100%;
  border-top: 2.5px solid #666;
  border-bottom: 2.5px solid #666;
  /*はじめは透過0に*/
  opacity: 0;
  transform: scale(0, 1);
  /*アニメーションの指定*/
  transition: all 0.3s;
}

/*背景の設定*/
.btnchangeline::after {
  content: "";
  /*絶対配置で背景の位置を決める*/
  position: absolute;
  bottom: 0;
  left: 0;
  z-index: 1;
  /*背景の形状*/
  width: 100%;
  height: 100%;
  background-color: #333;
  /*アニメーションの指定*/
  transition: all 0.3s;
}

/*hoverした際の背景と線の形状*/
.btnchangeline:hover::before {
  opacity: 1; /*不透明に*/
  transform: scale(1, 1); /*X方向に線を伸ばす*/
}

.btnchangeline:hover::after {
  opacity: 0; /*透過0に*/
  transform: scale(0, 1); /*X方向に背景を縮小*/
}

/*テキストの設定*/
.btnchangeline span {
  /*テキストを前面に出すためz-indexの値を高く設定*/
  position: relative;
  z-index: 2;
  /*テキストの形状*/
  color: #fff;
  /*アニメーションの指定*/
  transition: all 0.3s;
}

/*hoverした際のテキストの形状*/
.btnchangeline:hover span {
  letter-spacing: 2px;
  color: #333;
}

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

body {
  width: 100%;
  height: 100vh;
  vertical-align: middle;
  padding: 30px 0;
  text-align: center;

  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;

  background-image: linear-gradient(
    103.3deg,
    rgba(252, 225, 208, 1) 30%,
    rgba(255, 173, 214, 1) 55.7%,
    rgba(162, 186, 245, 1) 81.8%
  );
}

/*ボタンの配置*/
.btn-position {
  display: flex;
  flex-direction: column;
  align-items: center;
}

p {
  margin: 0 0 10px 0;
}

              
            
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JS

              
                
              
            
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999px

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