#next, #previous {
    display: inline;
    border-radius: 4px;
    background-color: rgb(64, 64, 243);
    border: none;
    color: #FFFFFF;
    text-align: center;
    font-size: 28px;
    padding: 20px;
    width: 200px;
    transition: all 0.5s;
    cursor: pointer;
    margin: 5px;
  }
  
#next, #previous{
    position : relative;
    cursor: pointer;
    display: inline-block;
    position: relative;
    transition: 0.5s;
  }
  
#next:after, #previous:after {
    content: '\00bb';
    position: absolute;
    opacity: 0;
    top: 0;
    right: -20px;
    transition: 0.5s;
  }
  
#next:hover, #previous:hover {
    padding-right: 25px;
  }
  
  .button:hover span:after {
    opacity: 1;
    right: 0;
  }