#accordionFlush .accordion-button {
    font-size: 14px
}
    #accordionFlush .accordion-button:focus {
        box-shadow:none
    }

    #accordionFlush .accordion-button:not(.collapsed) {
     
        background-color: #f7f7f7;
    }
#accordionFlush .accordion-collapse {
    background-color: #f7f7f7;
}