I use react-bootstrap, but I want to modify some of the elements, so I wrote my own custom.css. However it doesn't make any changes (only when I put !important, but the file is so large so it's not a good option).
import {MenuItem, Nav, Navbar, NavBrand, NavDropdown, NavItem} from "react-bootstrap";
import {LinkContainer, MenuItemLink} from "react-router-bootstrap";
import '../assets/css/custom.css';
This is what I did so far.
reactplugins CSS and also use properselector, of doing these you won't have to use!important.