.cd-top {
    width: 0px;
    height: 0px;
    position: fixed;
    float:right;
    border-left: 15px solid transparent;
    border-right: 15px solid transparent;
    border-bottom: 15px solid black;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
  /* image replacement properties */
    overflow: hidden;
    text-indent: 100%;
    white-space: nowrap;
    /* background: rgba(232, 98, 86, 0.8) url(img/arrow.png) no-repeat center 50%; */
    visibility: hidden;
    opacity: 0;
    -webkit-transition: opacity .3s 0s, visibility 0s .3s;
    -moz-transition: opacity .3s 0s, visibility 0s .3s;
    transition: opacity .3s 0s, visibility 0s .3s;
    bottom: 250px;
}
.cd-top.cd-is-visible, .cd-top.cd-fade-out, .no-touch .cd-top:hover {
      width: 0px;
      height: 0px;
      border-left: 15px solid transparent;
      border-right: 15px solid transparent;
      border-bottom: 15px solid rgba(29, 29, 29, 0.49);
      -webkit-transition: opacity .3s 0s, visibility 0s 0s;
      -moz-transition: opacity .3s 0s, visibility 0s 0s;
      transition: opacity .3s 0s, visibility 0s 0s;
}
.cd-top.cd-is-visible {
  /* the button becomes visible */
  visibility: visible;
  opacity: 1;
}
.cd-top.cd-fade-out {
  /* if the user keeps scrolling down, the button is out of focus and becomes less visible */
  opacity: .5;
}
.no-touch .cd-top:hover {
    width: 0px;
      height: 0px;
      border-left: 15px solid transparent;
      border-right: 15px solid transparent;
      border-bottom: 15px solid black;
  opacity: 1;
}
@media only screen and (min-width: 768px) {
  .cd-top {
    right: 20px;
    bottom: 20px;
  }
}
@media only screen and (min-width: 1024px) {
  .cd-top {
    height: 45px;
    width: 49px;
    right: 30px;
    bottom: 230px;
  }
}