Schema Black bar problem

Please provide a link to a page on your site where we can see this. Thanks.

Also, I recommend asking at https://wordpress.org/support/theme/schema-lite#new-post so the theme’s developers and support community can help you with this.

#sidebars #sidebar-search, #sidebars .widget.widget_search, #sidebars .widget.widget_product_search {
    background: initial;
}
#site-header {
    background: initial;
}
#logo a {
    color: #222;
}
.site-title a, .site-description, #navigation a {
    color: #222;
}

To add or override CSS: use the “Additional CSS” option in the customizer. https://codex.wordpress.org/CSS#Custom_CSS_in_WordPress

Learn to use the Chrome Developer Tools to help you see and test changes to your CSS.