fix: make form sections pattern background transparent

styles/25-patterns-form-sections.css

@@ -10,7 +10,6 @@
   display: flex;
   flex-direction: column;
   width: 100%;
-  background: var(--surface-form-preview);
   min-width: min(
     100%,
     calc(var(--layout-form-sections-label-column-width) + var(--spacing-small) + var(--layout-input-field-desktop-width))