diff --git a/doc/source/_static/custom.css b/doc/source/_static/custom.css
new file mode 100644
index 0000000000..a19561fb83
--- /dev/null
+++ b/doc/source/_static/custom.css
@@ -0,0 +1,6 @@
+@import "../ansys-sphinx-theme.css";
+
+.sphx-glr-thumbcontainer img {
+    max-height: 100% !important;
+    max-width: 100% !important;
+}
diff --git a/doc/source/_static/gallery_thumbnails/sphx_glr_001-materials_thumb.png b/doc/source/_static/gallery_thumbnails/sphx_glr_001-materials_thumb.png
index 6c2fa014dc..34d15397db 100644
Binary files a/doc/source/_static/gallery_thumbnails/sphx_glr_001-materials_thumb.png and b/doc/source/_static/gallery_thumbnails/sphx_glr_001-materials_thumb.png differ
diff --git a/doc/source/_static/gallery_thumbnails/sphx_glr_03-pymechanical-shell-workflow_thumb.png b/doc/source/_static/gallery_thumbnails/sphx_glr_03-pymechanical-shell-workflow_thumb.png
index 6ff574b0c6..a9ac41ec8a 100644
Binary files a/doc/source/_static/gallery_thumbnails/sphx_glr_03-pymechanical-shell-workflow_thumb.png and b/doc/source/_static/gallery_thumbnails/sphx_glr_03-pymechanical-shell-workflow_thumb.png differ
diff --git a/doc/source/_static/gallery_thumbnails/sphx_glr_04-pymechanical-solid-workflow_thumb.png b/doc/source/_static/gallery_thumbnails/sphx_glr_04-pymechanical-solid-workflow_thumb.png
index 418dab84b6..1e87c89701 100644
Binary files a/doc/source/_static/gallery_thumbnails/sphx_glr_04-pymechanical-solid-workflow_thumb.png and b/doc/source/_static/gallery_thumbnails/sphx_glr_04-pymechanical-solid-workflow_thumb.png differ
diff --git a/doc/source/_static/gallery_thumbnails/sphx_glr_05-pymechanical-to-cdb-workflow_thumb.png b/doc/source/_static/gallery_thumbnails/sphx_glr_05-pymechanical-to-cdb-workflow_thumb.png
index 9816156d7b..0bc6489c30 100644
Binary files a/doc/source/_static/gallery_thumbnails/sphx_glr_05-pymechanical-to-cdb-workflow_thumb.png and b/doc/source/_static/gallery_thumbnails/sphx_glr_05-pymechanical-to-cdb-workflow_thumb.png differ
diff --git a/doc/source/_static/gallery_thumbnails/sphx_glr_06-cdb-to-pymechanical-workflow_thumb.png b/doc/source/_static/gallery_thumbnails/sphx_glr_06-cdb-to-pymechanical-workflow_thumb.png
index 128e7340fe..140fb6a0d8 100644
Binary files a/doc/source/_static/gallery_thumbnails/sphx_glr_06-cdb-to-pymechanical-workflow_thumb.png and b/doc/source/_static/gallery_thumbnails/sphx_glr_06-cdb-to-pymechanical-workflow_thumb.png differ
diff --git a/doc/source/conf.py b/doc/source/conf.py
index ef8f70dc0c..0d1d437d39 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -308,7 +308,7 @@ def _signature(
     "exclude_implicit_doc": {"ansys\\.acp\\.core\\._.*"},  # ignore private submodules
     "image_scrapers": (DynamicScraper(), "matplotlib"),
     "ignore_pattern": r"__init__\.py",
-    "thumbnail_size": (350, 350),
+    "thumbnail_size": (320, 240),
     "remove_config_comments": True,
 }
 
@@ -318,6 +318,10 @@ def _signature(
 # static path
 html_static_path = ["_static"]
 
+# Custom CSS files
+# These paths are either relative to html_static_path or fully qualified paths (eg. https://...)
+html_css_files = ["custom.css"]
+
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ["_templates"]