Installled bootstrap to use its classes

assets/scss/base.scss

@@ -1,5 +1,5 @@
 @import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500&display=swap');
-
+@import "~bootstrap";
 $black: #141414;
 $orange: #d6972a;
 $font: 'Fira Code', monospace;

package-lock.json

@@ -1843,6 +1843,11 @@
       "integrity": "sha1-aN/1++YMUes3cl6p4+0xDcwed24=",
       "dev": true
     },
+    "bootstrap": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/bootstrap/-/bootstrap-5.1.0.tgz",
+      "integrity": "sha512-bs74WNI9BgBo3cEovmdMHikSKoXnDgA6VQjJ7TyTotU6L7d41ZyCEEelPwkYEzsG/Zjv3ie9IE3EMAje0W9Xew=="
+    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",

package.json

@@ -6,7 +6,9 @@
   "directories": {
     "lib": "lib"
   },
-  "dependencies": {},
+  "dependencies": {
+    "bootstrap": "^5.1.0"
+  },
   "devDependencies": {
     "@symfony/webpack-encore": "^1.5.0",
     "sass": "^1.37.5",