.easy-btn {
    background-color: #007f10 !important;
    color: #dddddd !important;
}

    .easy-btn:hover {
        background-color: #009914 !important;
    }

.medium-btn {
    background-color: #b38f00 !important;
    color: #dddddd !important;
}

    .medium-btn:hover {
        background-color: #cca300 !important;
    }

.hard-btn {
    background-color: #bf4800 !important;
    color: #dddddd !important;
}

    .hard-btn:hover {
        background-color: #d95300 !important;
    }