#to_page_top {
  z-index: 10000;
  width: 91px;
  height: 85px;
  position: fixed;
  right: 20px;
  bottom: 20px;
  background-image: url(../images/icon_page-top.png);
  background-size: cover;
}
#to_page_top a {
  position: relative;
  display: block;
  width: 91px;
  height: 85px;
  text-decoration: none;
}

@media screen and (max-width: 735px) {
  #to_page_top {
    z-index: 10000;
    width: 50px;
    height: 50px;
    position: fixed;
    right: 20px;
    bottom: 20px;
    background: #ffffff; /* 閭梧勹濶ｲ */
    opacity: 1.0; /* 騾乗�蠎ｦ */
    border-radius: 50%;
    border: solid 2px #669900;
  }
  #to_page_top a {
    position: relative;
    display: block;
    width: 50px;
    height: 50px;
    text-decoration: none;
  }
  #to_page_top a::before {
    font-family: 'Font Awesome 5 Free', 'Font Awesome';
    font-weight: 900;
    content: '\f106';
    font-size: 20px;
    color: #669900;
    position: absolute;
    width: 50px;
    height: 25px;
    top: -15px; /* 遏｢蜊ｰ縺ｮ荳贋ｸ九�菴咲ｽｮ繧定ｪｿ謨ｴ */
    bottom: 0;
    right: 0;
    left: 0;
    margin: auto;
    text-align: center;
  }
  #to_page_top a::after {
    font-weight: 900;
    content: 'TOP';
    font-size: 14px;
    color: #669900;
    position: absolute;
    width: 50px;
    height: 25px;
    top: 20px; /* 遏｢蜊ｰ縺ｮ荳贋ｸ九�菴咲ｽｮ繧定ｪｿ謨ｴ */
    bottom: 0;
    right: 0;
    left: 0;
    margin: auto;
    text-align: center;
  }
}