/*order-option*/
/*order-option*/
.back-to-top {
  padding: 10px;
  border-radius: 20px;
  background-color: #3a80c6;
  color: #fff;
  position: fixed;
  left: 50%;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-transition: bottom 0.2s;
  transition: bottom 0.2s;
  z-index: 1000;
  cursor: pointer;
}
.back-to-top.show {
   bottom: 50px;
   left: 50%;
   transform: translate(-50%, -50%);
}