diff --git a/docs/tools/mkdocs-material-theme/assets/stylesheets/custom.css b/docs/tools/mkdocs-material-theme/assets/stylesheets/custom.css
index 0024345554b..8569b1d033d 100644
--- a/docs/tools/mkdocs-material-theme/assets/stylesheets/custom.css
+++ b/docs/tools/mkdocs-material-theme/assets/stylesheets/custom.css
@@ -64,7 +64,7 @@
 }
 
 body {
-    font: 400 14pt/200% 'Yandex Sans Text Web', Arial, sans-serif;
+    font: 300 14pt/200% 'Yandex Sans Text Web', Arial, sans-serif;
 }
 
 body.md-lang-zh {
diff --git a/website/index.css b/website/index.css
index 56d1cc212ce..c5061595a9c 100644
--- a/website/index.css
+++ b/website/index.css
@@ -65,7 +65,7 @@
 
 body {
     background: #fff;
-    font: 400 14pt/200% 'Yandex Sans Text Web', Arial, sans-serif;
+    font: 300 14pt/200% 'Yandex Sans Text Web', Arial, sans-serif;
     margin: 0;
     padding: 0;
 }