Add explicit style for embedded table

app/assets/stylesheets/layout/_index.sass

@@ -45,6 +45,7 @@
 
 // Work packages page layouts
 @import layout/work_package_table
+@import layout/work_package_table_embedded
 @import layout/work_packages_details_view
 @import layout/work_packages_full_view
 @import layout/work_package_mobile

app/assets/stylesheets/layout/_work_package_table_embedded.sass

@@ -0,0 +1,33 @@
+//-- copyright
+// OpenProject is a project management system.
+// Copyright (C) 2012-2018 the OpenProject Foundation (OPF)
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License version 3.
+//
+// OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+// Copyright (C) 2006-2017 Jean-Philippe Lang
+// Copyright (C) 2010-2013 the ChiliProject Team
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 2
+// of the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+// See docs/COPYRIGHT.rdoc for more details.
+//++
+
+// Disable CSS containment in the embedded container
+// unless we're setting an external height with overflow, containment will not work.
+.work-packages-embedded-view--container
+  .work-package-table--container
+    contain: initial !important