ISTWCMS-5898: section-spacing-seperator and column-seperator css

ISTWCMS-5898: Adding the bottom lines when narrow and adjusting spacing in cards: event news blog and web page

src/patterns/03-layouts/layout/_layout.scss

@@ -654,11 +654,19 @@
     }
   }
 }
+// Set default spacing to match old block margin if no classes
+.layout.layout--uw-1-col {
+  &:not(.uw-section-spacing--default, .uw-section-spacing--none, .uw-section-spacing--75, .uw-section-spacing--50, .uw-section-spacing--25) {
+    margin-bottom: var(--section-margin);
+    &:last-of-type{
+      margin-bottom: 0;
+    }
+  }
+}
 .uw-section-has-full-width .layout.layout--uw-1-col{
   overflow: hidden;
 }
 
-
 .uw-full-width.uw-section-spacing--none.uw-section-separator--bottom:has(img){
   padding-bottom: 0;
 }