change narrow content to 50 percent instead of 800 pixels

app/assets/stylesheets/partials/_layout.scss

@@ -40,5 +40,17 @@
 }
 
 .content-narrow {
-  max-width: 800px;
+  max-width: 50%;
+}
+
+.dynamic-content {
+  @extend .col;
+  @extend .col-sm-10;
+  @extend .col-md-8;
+  @extend .col-lg-7;
+  @extend .col-xl-5;
+}
+
+.grid-container {
+  display: grid;
 }