button {
    border-radius: 3px;
    border: none;
    background-color: #555;
    color: #efefef;
    font-weight: 200;
    outline: none;
    padding: 5px 15px;
    cursor: pointer;
}

    button.classic {
        color: #555;
        background-color: #efefef;
        border: 1px solid #dedede;
    }

    button:disabled {
        opacity: 0.6;
    }