.btn {
    cursor: pointer;
    font-size: 18px;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    box-shadow: 0 4px #222;
    margin-right: 10px;
}
.btn[disabled], .btn[disabled]:hover, .btn[disabled]:active {
    background-color: #cccccc;
    color: #666666;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}