diff --git a/doc/arm/Makefile.am b/doc/arm/Makefile.am
index e8024040f0..798d6ba839 100644
--- a/doc/arm/Makefile.am
+++ b/doc/arm/Makefile.am
@@ -61,6 +61,7 @@ EXTRA_DIST =					\
 	troubleshooting.inc.rst			\
 	tsig.inc.rst				\
 	zones.inc.rst				\
+	_static/custom.css			\
 	../dnssec-guide				\
 	../misc/acl.grammar.rst			\
 	../misc/controls.grammar.rst		\
diff --git a/doc/arm/_static/custom.css b/doc/arm/_static/custom.css
new file mode 100644
index 0000000000..e81d66d321
--- /dev/null
+++ b/doc/arm/_static/custom.css
@@ -0,0 +1,17 @@
+/*
+Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+
+SPDX-License-Identifier: MPL-2.0
+
+This Source Code Form is subject to the terms of the Mozilla Public
+License, v. 2.0.  If a copy of the MPL was not distributed with this
+file, you can obtain one at https://mozilla.org/MPL/2.0/.
+
+See the COPYRIGHT file distributed with this work for additional
+information regarding copyright ownership.
+*/
+
+/* make table content wrappable */
+.wy-table-responsive table td {
+    white-space:normal;
+}
diff --git a/doc/arm/conf.py b/doc/arm/conf.py
index 60131b41f6..403b6cf529 100644
--- a/doc/arm/conf.py
+++ b/doc/arm/conf.py
@@ -154,6 +154,10 @@ master_doc = 'index'
 # a list of builtin themes.
 #
 html_theme = 'sphinx_rtd_theme'
+html_static_path = ['_static']
+html_css_files = [
+    'custom.css'
+]
 
 # -- Options for EPUB output -------------------------------------------------