Issue #3090904 by amateescu, dixon_, breakfull, lauriii, jhuhta,...

Issue #3090904 by amateescu, dixon_, breakfull, lauriii, jhuhta, StevenAvelino, shaal, ChrisDarke, realityloop, Michael.J.Gleeson, vints24, martamarczak: Workspace drawer CSS fix for better consistency

(cherry picked from commit 98687124)

core/modules/workspaces/css/workspaces.toolbar.css

@@ -239,6 +239,7 @@
     position: fixed;
     top: 0;
     right: 0;
+    box-sizing: content-box;
     width: calc(30% - 80px);
     height: 140px;
     padding: 20px 40px 0;