Hello,

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

body .basel-toolbar {
    background-color: black;
}
body .basel-toolbar-item > a {
    color:white!important;
}
.icons-design-line .shopping-cart>a:before,
.icons-design-line .wishlist-info-widget>a:before {
color:white!important;
}

.wishlist-info-widget>a:hover:after {
   color:white!important;
}
 .basel-toolbar>div a span.basel-toolbar-label {
    color: white;
}
 .basel-toolbar>div a:hover span.basel-toolbar-label {
    color: white;
}

Best Regards