load bootstrap scss in compilation

app/scss/_custom.scss

@@ -1,3 +1,4 @@
+
 div.coucou {
   margin: 1em;
   padding: 2em;

app/scss/_variables.scss

@@ -0,0 +1,2 @@
+$primary: pink;
+$enable-shadows: true;

app/scss/styles.scss

@@ -0,0 +1,61 @@
+/// ------------------------------------
+/// Option A: Include all of Bootstrap
+/// ------------------------------------
+//@import "../node_modules/bootstrap/scss/bootstrap";
+
+/// ------------------------------------
+/// Option B: Include parts of Bootstrap
+/// ------------------------------------
+
+@import "../node_modules/bootstrap/scss/mixins/banner";
+@include bsBanner("");
+
+// 1. Include functions first (so you can manipulate colors, SVGs, calc, etc)
+@import "../node_modules/bootstrap/scss/functions";
+
+// 2. Include any default variable overrides here
+@import "variables";
+
+// 3. Include remainder of required Bootstrap stylesheets
+@import "../node_modules/bootstrap/scss/variables";
+@import "../node_modules/bootstrap/scss/maps";
+@import "../node_modules/bootstrap/scss/mixins";
+
+// 4. Include any optional Bootstrap components as you like
+@import "../node_modules/bootstrap/scss/utilities";
+@import "../node_modules/bootstrap/scss/root";
+@import "../node_modules/bootstrap/scss/reboot";
+@import "../node_modules/bootstrap/scss/type";
+@import "../node_modules/bootstrap/scss/images";
+@import "../node_modules/bootstrap/scss/containers";
+@import "../node_modules/bootstrap/scss/grid";
+@import "../node_modules/bootstrap/scss/tables";
+@import "../node_modules/bootstrap/scss/forms";
+@import "../node_modules/bootstrap/scss/buttons";
+@import "../node_modules/bootstrap/scss/transitions";
+@import "../node_modules/bootstrap/scss/dropdown";
+@import "../node_modules/bootstrap/scss/button-group";
+@import "../node_modules/bootstrap/scss/nav";
+@import "../node_modules/bootstrap/scss/navbar";
+@import "../node_modules/bootstrap/scss/card";
+@import "../node_modules/bootstrap/scss/accordion";
+@import "../node_modules/bootstrap/scss/breadcrumb";
+@import "../node_modules/bootstrap/scss/pagination";
+@import "../node_modules/bootstrap/scss/badge";
+@import "../node_modules/bootstrap/scss/alert";
+@import "../node_modules/bootstrap/scss/progress";
+@import "../node_modules/bootstrap/scss/list-group";
+@import "../node_modules/bootstrap/scss/close";
+@import "../node_modules/bootstrap/scss/toasts";
+@import "../node_modules/bootstrap/scss/modal";
+@import "../node_modules/bootstrap/scss/tooltip";
+@import "../node_modules/bootstrap/scss/popover";
+@import "../node_modules/bootstrap/scss/carousel";
+@import "../node_modules/bootstrap/scss/spinners";
+@import "../node_modules/bootstrap/scss/offcanvas";
+@import "../node_modules/bootstrap/scss/placeholders";
+@import "../node_modules/bootstrap/scss/helpers";
+@import "../node_modules/bootstrap/scss/utilities/api";
+
+// 5. Add additional custom code here
+@import "custom";