@charset 'UTF-8';
    .button-bg {
    font-family: "FP-ヒラギノ角ゴ ProN W6";
      background: #fff;
    border-radius: 4px;
      text-align: center;
      box-sizing: border-box;
      /* 中央揃え */
      display: block;
      margin: 0 auto;
      /* 幅の指定 */
      width: 100%;
    /*  max-width: 500px; */
      padding: 20px;
      /* 色の指定 */
      color: #ff9300;
    /*  font-weight: bold;*/
      border: 2px solid #ff9300;
      position: relative;
      overflow: hidden;
    }
    .button-bg::after {
      content: "";
      display: block;
      width: 100%;
      height: 100%;
      background: #ff9300;
      position: absolute;
      top: 0;
      left: 0;
     z-index: -1;
      transition: transform 0.3s;
    }
    .button-bg.from-left::after {
      transform: translate(-100%);
    }
    .button-bg.from-right::after {
      transform: translate(200%);
    }
    .button-bg.from-top::after {
      transform: translate(0, -100%);
    }
    .button-bg.from-bottom::after {
      transform: translate(0, 200%);
    }
    .button-bg:hover {
      position: sticky;
    z-index: 99;
      color: #fff;
    }
    .button-bg:hover::after {
      transform: translate(0);
    }
    .button-bg:active, .button-bg:focus {
      top: 2px;
    }