.facebook:hover, .facebook:focus, .facebook:active{
  background-color: #3b5998;
}

.medium:hover, .medium:focus, .medium:active{
  background-color: #111111;
}

.twitter:hover, .twitter:focus, .twitter:active{
  background-color: #1da1f2;
}

.instagram:hover, .instagram:focus, .instagram:active{
  background-color: #833ab4;
}

.linkedin:hover, .linkedin:focus, .linkedin:active{
  background-color: #0077b5;
}

.cd-top {
  display: inline-block;
  height: 40px;
  width: 40px;
  position: fixed;
  bottom: 40px;
  right: 10px;
  -webkit-box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
          box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
  /* image replacement properties */
  overflow: hidden;
  text-indent: 100%;
  white-space: nowrap;
  background: rgba(33, 136, 56, 1) url(../svg/cd-top-arrow.svg) no-repeat center 50%;
  visibility: hidden;
  opacity: 0;
  -webkit-transition: opacity .3s 0s, visibility 0s .3s, background-color .3s 0s;
  transition: opacity .3s 0s, visibility 0s .3s, background-color .3s 0s;
  border-radius:30px;
}

.cd-top.cd-top--show,
.cd-top.cd-top--fade-out,
.cd-top:hover {
  -webkit-transition: opacity .3s 0s, visibility 0s 0s, background-color .3s 0s;
  transition: opacity .3s 0s, visibility 0s 0s, background-color .3s 0s;
}

.cd-top.cd-top--show {
  /* the button becomes visible */
  visibility: visible;
  opacity: 1;
}

.cd-top.cd-top--fade-out {
  /* if the user keeps scrolling down, the button is out of focus and becomes less visible */
  opacity: .5;
}

.cd-top:hover {
  background-color: #28a745;
  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: 60px;
    width: 60px;
    right: 30px;
    bottom: 30px;
  }
}