Most pages are now styled.

Small changes to existing pages.
Changes to base layout style.

resources/assets/sass/abstracts/_mixin.scss

@@ -1,5 +1,9 @@
 @use "variables" as *;
 
+@mixin container {
+  max-width: 1170px;
+  margin: 0 auto;
+}
 @mixin reset-list {
   margin: 0;
   padding: 0;