.button {
    background: #000000;
    border-radius: 12px;
    box-shadow: 1px 1px 3px #666666;
    text-align: center;
    font-family:sans-serif;
    color: #ffffff;
    font-size: 18px;
    padding: 8px 16px 8px 16px;
    text-decoration: none;
    transition: all 0.5s;
    cursor: pointer;
    margin: 5px;
}

.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: 25px;
}

.button:hover span:after {
    opacity: 1;
    right: 0;
}
/*
.btn:hover {
  background: #3cb0fd;
  background-image: -webkit-linear-gradient(top, #3cb0fd, #3498db);
  background-image: -moz-linear-gradient(top, #3cb0fd, #3498db);
  background-image: -ms-linear-gradient(top, #3cb0fd, #3498db);
  background-image: -o-linear-gradient(top, #3cb0fd, #3498db);
  background-image: linear-gradient(to bottom, #3cb0fd, #3498db);
  text-decoration: none;
}*/