body .button
{
    border-style: groove;
    border-width: medium;
    border-color: inherit;
    border-radius: 9px;
    color: #FFFFFF;
    text-align: center;
    text-decoration: underline;
    font-size: 18px;
    padding: 20px 0px 20px 0px;
    width: 720px;
    transition: all 0.5s;
    cursor: progress;
    background-color: #339966;
}

.button span {
  cursor: pointer;
  display: inline-block;
  position: relative;
  transition: 0.5s;
}

.button span:after {
  content: '\00bb';
  position: absolute;
  opacity: 0;
  top: 0;
  right: 20px;
  transition: 0.5s;
}

.button:hover span {
  padding-right: 15px;
    
}

.button:hover span:after {
  opacity: 1;
  right: 0;
}