MC-4116: Update slider to use new background images logic

- fix content placeholder text position on stage

Author: anthoula

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/content-type/slide/_collage-center.less

@@ -22,6 +22,11 @@
                 right: 29px;
                 top: 30px !important;
             }
+
+            .pagebuilder-empty-slide {
+                padding: 30px;
+                text-align: left;
+            }
         }
     }
 }

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/content-type/slide/_collage-left.less

@@ -20,6 +20,11 @@
                 right: 29px;
                 top: 30px !important;
             }
+
+            .pagebuilder-empty-slide {
+                padding: 30px;
+                text-align: left;
+            }
         }
     }
 }

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/content-type/slide/_collage-right.less

@@ -21,6 +21,11 @@
                 right: 29px;
                 top: 30px !important;
             }
+
+            .pagebuilder-empty-slide {
+                padding: 30px;
+                text-align: left;
+            }
         }
     }
 }