Not sure what am I missing...
I did try with css and scss and different combinations in .scss file. Still I don't see(in Inspect Element) it is taking the css from bootstrap.
Yes, I do have bootstrap css and scss files in the corresponding path.
angular.json
   "styles": [
      "src/styles.scss",
      "node_modules/bootstrap/scss/bootstrap.scss",
      "node_modules/bootstrap/dist/css/bootstrap.min.css",
      "node_modules/font-awesome/css/font-awesome.min.css"
    ],
    "scripts": [
      "node_modules/jquery/dist/jquery.min.js",
      "node_modules/bootstrap/dist/js/bootstrap.min.js"
    ]
styles.scss
@import '~bootstrap/scss/bootstrap';
@import "~bootstrap/scss/functions";
@import "~bootstrap/scss/variables";
@import "~bootstrap/scss/mixins";
@import "~bootstrap/scss/grid";
@import "~bootstrap/scss/navbar";
@import "~bootstrap/scss/forms";
@import '~bootstrap/scss/bootstrap.scss';
@import "styles-variables.scss";
@import "~@angular/material/prebuilt-themes/indigo-pink.css";
@import "~ng-pick-datetime/assets/style/picker.min.css";
somemore information, if that can give any clue. Not sure if it is because of mat-side-nav



 
     
     
    