/* ---------------------------------
TOPに戻る
--------------------------------- */
.side_top {
    position: fixed;
    right: 4px;
    bottom: 20px;
    margin-top: 6px;
    width: 40px;
    height: 40px;
    background-color: #44af35;
    border-radius: 80px;
    margin-right: 2px;
    z-index: 1000;
    opacity: 0;
    transition: all 0.65s;
    border: none;
    border: 2px solid white;
    display: flex;              /* フレックスボックスを使う */
    align-items: center;        /* 縦方向中央揃え */
    justify-content: center; 
    padding: 0;
    padding-left: 1px;
    }

    .side_top.isActive {
      opacity: 1;
      transition: all 0.65s;
    }
     .side_top img {
        width: 13px;
        transform: rotate(-90deg);
    }
    @media(min-width:768px){
      .side_top {
      right: 10px;
      bottom: 15px;
      width: 44px;
      height: 44px;
      padding:10px 12px;
    }

    .side_top.isActive {
      opacity: 1;
      transition: all 0.65s;
    }
     .side_top img {
        width: 17px;
        transform: rotate(-90deg);
    }
    }
    @media(min-width:920px) {
      .side_top {
    bottom: 38px;
    width: 44px;
    height: 44px;
    margin-right: 4px;
    padding: 8px 13px 13px;
    right: 15px;
    }
.side_top img {
        width: 13px;
    }
    .side_top:hover {
  background-color: #39922c;
  transition: 0.3s;
}
    }