Update _listings.less

Author: divyajyothi5321

app/design/frontend/Magento/luma/Magento_Catalog/web/css/source/module/_listings.less

@@ -108,6 +108,13 @@
                 .actions-primary {
                     display: inline-block;
                     vertical-align: middle;
+                    
+                    > .stock.unavailable {
+                        line-height: 1;
+                        padding-bottom: @indent__s;
+                        padding-right: 24px;
+                        padding-top: @indent__s;
+                    }
                 }
             }