.button {
    fill: white;
    pointer-events: all;
    display: inline-block;
    border-radius: 10px;
    border: 4px double #cccccc;
    color: black;
    text-align: center;
    font-size: 15px;
    padding: 10px;
    width: 50px;
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    -o-transition: all 0.5s;
    transition: all 0.5s;
    cursor: pointer;
    margin: 5px;
}
.button:hover {
    fill: pink;
}