body {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}

#scroll-top {
    position: fixed;
    bottom: 15px;
    right: 15px;
    width: 45px;
    height: 45px;
    font-size: 28px;
    background-color: rgba(149,149,163,0.70);
    border-radius: 100%;
    cursor: pointer;
}
#scroll-top span {
  position: absolute;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -12px;
  height: 0;
  width: 0;
  border: 8px solid transparent;
  border-bottom-color: #ffffff;
}
#scroll-top:hover {
  transition: 0.3s;
  box-shadow: 0 0 20px 4px #fff;
}