#support-tab, #goTopBtn {
  z-index: 9;
  right: 20px;
  bottom: 90px;
  width: 50px;
  height: 50px;
  padding: 0;
  border-radius: 25px;
  line-height: 50px;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  -webkit-transition: width .15s ease-out;
  transition: width .15s ease-out;
  position: fixed;
  cursor: pointer;
  font-weight: 500;
  overflow: hidden;
  text-decoration: none;
  background: url(../image/kline.png) no-repeat #4b4847;
  background-size: 28px;
  background-position: 11px center;
  outline: none;
}

#goTopBtn {
  background-image: url(../image/kgotop.png);
  bottom: 20px;
}

#support-tab span, #goTopBtn span {
  color: #fff;
  display: none;
}

#support-tab:hover, #goTopBtn:hover {
  width: 146px;
  background-position: 20px center;
}

#support-tab:hover span, #goTopBtn:hover span {
  display: inline;
  padding-left: 38px;
}

#goTopBtn.hidden {
  display: none;
}