25703 change margin bottom value to fix issue

Author: Fabricio Sobral

app/design/frontend/Magento/luma/Magento_Checkout/web/css/source/module/_cart.less

@@ -113,7 +113,7 @@
 
         .page-main & {
             .block {
-                margin-bottom: 0;
+                margin-bottom: 20px;
             }
         }