#accordion .card-header:after {
    font-family: 'FontAwesome';
    content: "\f106";
    float: right;
}
#accordion .card-header.collapsed:after {
     /* symbol for "collapsed" panels */
     content: "\f107";
 }
#accordion .card-header {
background-color: transparent;
}

#accordion .card {
    border-radius: unset;
}
#accordion .card .card-body   {
    -webkit-box-shadow: none;
    -moz-box-shadow: none;
    box-shadow: none !important;
}