a.button {
    padding: 6px 10px;
    border: solid 1px #5b5b5b;
    background-color: #adadad;
    color: white !important;
    border-radius: 10px;
    white-space: nowrap;
    text-align: center;
    font-size: 13px;
    text-decoration: none;
}

    a.button span {
        color: white;
    }