body{
    background-color: dimgray;
}

.container {
    display: flex;
    align-items: center;
    justify-content: center;
    height: auto;
}

button {
    display: inline-block;
    background-color: #7b38d8;
    border-radius: 10px;
    border: 4px double #cccccc;
    color: #eeeeee;
    text-align: center;
    font-size: 70px;
    padding: 20px;
    width: 600px;
    height: 200px;
    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 {
    background-color: #f7c2f9;
}
button:hover span {
    padding-right: 25px;
}
button:hover span:after {
    opacity: 1;
    right: 0;
}