visual composer error

Hi

Need help ...... it s funny if I use accordion colour in any otheer colour it is excepting the change but not to black so i put this

.vc_tta.vc_tta-accordion.vc_tta-style-classic .vc_tta-panels-container .vc_tta-panels .vc_tta-panel.vc_active .vc_tta-panel-heading a {
background -color: #000000!important;
colour: #ffffff;
}

still no colour cjange to black