In my project I have installed dropdown tree select and I want to use custom css for this. However, if I add a new rule in my webpack config, the plugin works fine but all other css is mashed up.

And if i remove the rule than all other css works fine but this dropdown tree select doesn't work properly.

react dropdown tree select with country flag so in that case i have to add some custom css.

below is my webpack config. So can you tell me which rule I have to add/remove in my webpack config?

```
{
    test: /\.css$/,
    use: ExtractTextPlugin.extract({
        fallback: 'style-loader',
        use: [
        {
            loader: 'css-loader'
        }
        ]
    }),
    include: /node_modules[/\\]react-dropdown-tree-select/
    },

    // "postcss" loader applies autoprefixer to our CSS.
    // "css" loader resolves paths in CSS and adds assets as dependencies.
    // "style" loader turns CSS into JS modules that inject <style> tags.
    // In production, we use a plugin to extract that CSS to a file, but
    // in development "style" loader enables hot editing of CSS.
    {
    test: /\.css$/,
    use: [
        require.resolve('style-loader'),
        {
        loader: require.resolve('css-loader'),
        options: {
            importLoaders: 1,
            modules:true,
            localIdentName:'[Name]__[local]__[has:base64:5]'
        },
        },
        {
        loader: require.resolve('postcss-loader'),
        options: {
            // Necessary for external CSS imports to work
            // https://github.com/facebookincubator/create-react-app/issues/2677
            ident: 'postcss',
            plugins: () => [
            require('postcss-flexbugs-fixes'),
            autoprefixer({
                browsers: [
                '>1%',
                'last 4 versions',
                'Firefox ESR',
                'not ie < 9', // React doesn't support IE8 anyway
                ],
                flexbox: 'no-2009',
            }),
            ],
        },
        },
    ],
    }, 

    plugins: [
        new ExtractTextPlugin("styles.css"),

```