.topbtn {
  position: fixed;
  top: 80%;
  right: 30px;
  z-index: 999;
}
.topbtn li {
  margin-top: 10px;
  height: 30px;
}
.topbtn a {
  display: block;
  position: relative;
  width: 30px;
  height: 30px;
  background: #efefef;
  border-radius: 3px;
  transition: opacity .6s ease-in-out;
}
.topbtn a.disable {
  opacity: .6;
  cursor: default;
}
.topbtn a.disable:hover:before {
  border-top-color: #999;
  border-bottom-color: #999;
}
.topbtn a:before {
  transition: .3s ease-in-out;
}
.topbtn a:hover:before {
  border-top-color: #c80000;
  border-bottom-color: #c80000;
}

.topbtn .icon {
  position: absolute;
  font-size: 14px;
  padding:6px 0 0 7px;
}

@keyframes swings {
  0% {right:120px;}
  100% {right:150px;}
}

@media screen and (max-width: 767px) {
.topbtn {
  position: fixed;
  top: 80%;
  right: 15px;
  z-index: 999;
}
}