/** code by webdevtrick ( https://webdevtrick.com) **/

.backtotop {
  position: fixed;
  display: block;
  box-sizing: border-box;
  height: 50px;
  width: 50px;
  background-color: #585858;
  border-radius: 3px;
  bottom: 50px;
  right: 50px;
  margin-right: -30px;
  outline: none;
  opacity: 0;
  transition: opacity .3s ease, margin-right .5s ease-out;
}

.backtotop-visible {
  transition: opacity .3s ease, margin-right .5s ease-out;
  margin-right: 0px;
  opacity: .6;
}

.backtotop::before,
.backtotop::after {
  content: '';
  position: absolute;
  height: 18px;
  width: 2px;
  background-color: #fff;
  top: 16px;
}

.backtotop::before {
  left: 18px;
  transform: rotate(45deg);
}

.backtotop::after {
  right: 18px;
  transform: rotate(-45deg);
}