Merge pull request #10788 from overleaf/jel-new-css-default-theme

[web] Update default theme PDF pane background color on new CSS

GitOrigin-RevId: c345b7597bb4a146042e481d1ea96cfd74b3a28b

services/web/frontend/stylesheets/variables/all.less

@@ -868,7 +868,7 @@
 
 // PDF and logs
 @pdf-top-offset: @toolbar-small-height;
-@pdf-bg: @neutral-20;
+@pdf-bg: @neutral-10;
 @pdfjs-bg: transparent;
 @pdf-page-shadow-color: rgba(0, 0, 0, 0.5);
 @logs-pane-bg: @neutral-80;

services/web/frontend/stylesheets/variables/themes/light.less

@@ -60,7 +60,6 @@
 
 @toolbar-header-bg-color: #fff;
 @toolbar-header-btn-border-color: @neutral-20;
-@toolbar-header-branded-btn-bg-color: @neutral-70;
 @toolbar-btn-color: @neutral-70;
 @toolbar-btn-hover-color: @neutral-70;
 @toolbar-btn-hover-bg-color: @neutral-10;
@@ -71,7 +70,6 @@
 @project-name-color: @neutral-70;
 @project-rename-link-color: @neutral-70;
 @project-rename-link-color-hover: @neutral-70;
-@pdf-bg: @neutral-10;
 @logs-pane-bg: @neutral-10;
 
 // Navbar