diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 103b50a5c3f593c3936d7e88e13cf0b61244fb9d..cbf23382b3de4131342664f0b95b397b18816e68 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -1,5 +1,9 @@
 version: 2
 
+build:
+  os: ubuntu-20.04
+  tools:
+    python: "3.10"
 python:
   install:
     - requirements: ./requirements.txt
diff --git a/source/conf.py b/source/conf.py
index 9f41ea72fd2dd399c601ab0d066d4e674ec504e8..f6d7901414d5482db58786216244b7c4be5508f9 100644
--- a/source/conf.py
+++ b/source/conf.py
@@ -29,7 +29,7 @@ intersphinx_mapping = {
     "sphinx": ("https://www.sphinx-doc.org/en/master/", None),
 }
 intersphinx_disabled_domains = ["std"]
-sphinx_rtd_size_width = "90%"
+sphinx_rtd_size_width = "100%"
 
 
 templates_path = ["_templates"]