a {
  text-decoration: none;
  /*display: inline-block;*/
  /*padding: 8px 16px;*/
  color: transparent;
  /*opacity: 0.6;*/
}

a:link {
color:dimgray;
}

a:hover {
    color: dimgray;
}

a:disabled:hover {
    color: transparent;
}

a:disabled {
    background-color: transparent;
}

a:enabled:hover {
  background-color: #ddd;
  color: blue;
}

.previous {
  background-color: #f1f1f1;
  color: black;
  position: absolute;
  top: 7%;
  left: 30px;
  opacity: 0.6;
}

.next {
  background-color:#4CAF50;
  color: white;
  position: absolute;
  top: 7%;
  right: 30px;
  opacity: 0.6;
}

.round {
    border-radius: 50%;
}