Remove content div wrappers. Use grid template columns for main to support stretch and breakout classes.

assets/sass/base/forms/_forms.scss

@@ -5,11 +5,6 @@
 form {
   // Add vertical rhythm margins.
   @include margin-block(1);
-
-  // Set max text line width in main for readability.
-  .main & {
-    max-width: var(--max-line-width);
-  }
 }
 
 input,
@@ -28,6 +23,14 @@ label {
   }
 }
 
+// Set max text line width in main for readability.
+input,
+label,
+textarea,
+select {
+  max-width: var(--max-line-width);
+}
+
 fieldset {
   border: 1px solid var(--color-border);
 }