Hello,

Please add this code to the Theme Settings > Custom CSS > Global:

body .sidebar-container {
   background-color:black;
	padding:20px 5px;
}
body .sidebar-container .widget-title {
 color:white;
}
body .sidebar-container .woodmart-woocommerce-layered-nav li a  {
    color:white;
}
body .sidebar-container .woodmart-woocommerce-layered-nav li  span {
    color:white;
	border-color:white;
}

Best Regards