html,
body {
  position: relative;
}
#back {
  padding: 6px 15px;
  position: absolute;
  top: 20px;
  left: 20px;
  z-index: 5;
  background: rgba(255, 255, 255, 0.6);
  color: #000;
  font-size: 12px;
  cursor: pointer;
  border-radius: 20px;
  box-shadow: rgba(0, 0, 0, 0.15) 0 5px 15px;
  transition: all 0.27s ease 0s;
  text-decoration: none;
  z-index: 200;
  font-family: "Times New Roman", "YuMincho", "Hiragino Mincho ProN", "Yu Mincho", "MS PMincho", serif;
}
#back:hover {
  box-shadow: rgba(255, 255, 255, 0.6) 0 0 5px;
}
#back::before {
  content: "";
  width: 12px;
  height: 12px;
  display: inline-block;
  vertical-align: middle;
  background: url('../css/icons/ic_arrow1.svg') no-repeat center top;
  background-size: cover;
  margin: 0 8px 3px 0;
}