Rename content margin top variable to content margin vertical, as it affects both top and bottom.

services/web/public/stylesheets/app/project-list.less

@@ -50,8 +50,8 @@
 		}
 		.project-list-sidebar {
 			background-color: @sidebar-bg;
-			padding-top: @content-margin-top;
-			padding-bottom: @content-margin-top;
+			padding-top: @content-margin-vertical;
+			padding-bottom: @content-margin-vertical;
 		} 
 
 		.project-list-sidebar when (@is-overleaf) {
@@ -62,8 +62,8 @@
 		}
 
 		.project-list-main {
-			padding-top: @content-margin-top;
-			padding-bottom: @content-margin-top;
+			padding-top: @content-margin-vertical;
+			padding-bottom: @content-margin-vertical;
 			height: 100%;
 			overflow: hidden;
 		}

services/web/public/stylesheets/core/_common-variables.less

@@ -788,9 +788,7 @@
 //** Horizontal offset for forms and lists.
 @component-offset-horizontal: 180px;
 
-@content-margin-top: @line-height-computed;
-@content-margin-top: @line-height-computed;
-
+@content-margin-vertical: @line-height-computed;
 
 @left-menu-width: 260px;
 @left-menu-animation-duration: 0.35s;

services/web/public/stylesheets/core/scaffolding.less

@@ -144,8 +144,8 @@ hr {
 }
 
 .content {
-  padding-top: @content-margin-top;
-  padding-bottom: @content-margin-top;
+  padding-top: @content-margin-vertical;
+  padding-bottom: @content-margin-vertical;
 }
 
 .content-alt {