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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="btnarrow">矢印が縮む</a>
  </div>
</body>
              
            
!

CSS

              
                @charset "utf-8";

/*矢印が右に移動して背景がつく*/
.btnarrow {
  /*矢印の基点とするためrelativeを指定*/
  position: relative;
  /*ボタンの形状*/
  background: #333;
  padding: 5px 60px 5px 30px;
  margin: 20px 0;
  display: inline-block;
  text-align: center;
  transition: all 0.2s linear;
  color: #fff;
  text-decoration: none;
  border: transparent 2px solid;
  outline: none;

  font-size: max(14px, 2vw);
  white-space: nowrap;
  width: max(150px, 40vw);

  /*アニメーションの指定*/
  transition: all 0.2s linear;
}

.btnarrow:hover {
  background: #fff;
  color: #333;
  border-color: #333;
}

/*矢印と線の形状*/
.btnarrow:before {
  content: "";
  /*絶対配置で線の位置を決める*/
  position: absolute;
  top: 50%;
  right: 20px;
  /*線の形状*/
  width: 20px;
  height: 1px;
  background: #fff;
}

.btnarrow::after {
  content: "";
  /*絶対配置で矢印の位置を決める*/
  position: absolute;
  top: 40%;
  right: 12px;
  /*矢印の形状*/
  border: 4px solid transparent;
  border-top-width: 4px;
  border-bottom-width: 4px;
  border-left-color: #fff;
  /*アニメーションの指定*/
  transition: all 0.2s linear;
}

/*hoverした際の矢印の形状*/
.btnarrow:hover::before {
  background: #333;
  right: 25px;
}

.btnarrow:hover::after {
  border-left-color: #333;
  right: 20px;
}

/*========= 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;
  justify-content: center;
}

p {
  margin: 0 0 10px 0;
}

              
            
!

JS

              
                
              
            
!
999px

Console