diff --git a/_shared_assets/static/custom.css b/_shared_assets/static/custom.css
index 1c5b5dcc0ee..611c491c4a6 100644
--- a/_shared_assets/static/custom.css
+++ b/_shared_assets/static/custom.css
@@ -2,6 +2,16 @@
  * FIX THE DESIGN OF THE RTD THEME
  */
 
+body,
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+	font-family: system-ui, -apple-system, "Segoe UI", Roboto, Oxygen-Sans, Cantarell, Ubuntu, "Helvetica Neue", "Noto Sans", "Liberation Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
+}
+
 /* NC blue */
 .wy-side-nav-search {
 	background-color: #0082c9;
diff --git a/static/css/fonts/OpenSans-Bold.ttf b/static/css/fonts/OpenSans-Bold.ttf
deleted file mode 100644
index fd79d43bea0..00000000000
Binary files a/static/css/fonts/OpenSans-Bold.ttf and /dev/null differ
diff --git a/static/css/fonts/OpenSans-Bold.woff b/static/css/fonts/OpenSans-Bold.woff
deleted file mode 100644
index ee2ea797d1c..00000000000
Binary files a/static/css/fonts/OpenSans-Bold.woff and /dev/null differ
diff --git a/static/css/fonts/OpenSans-Italic.ttf b/static/css/fonts/OpenSans-Italic.ttf
deleted file mode 100644
index c90da48ff3b..00000000000
Binary files a/static/css/fonts/OpenSans-Italic.ttf and /dev/null differ
diff --git a/static/css/fonts/OpenSans-Italic.woff b/static/css/fonts/OpenSans-Italic.woff
deleted file mode 100644
index ff652e64356..00000000000
Binary files a/static/css/fonts/OpenSans-Italic.woff and /dev/null differ
diff --git a/static/css/fonts/OpenSans-Light.ttf b/static/css/fonts/OpenSans-Light.ttf
deleted file mode 100644
index 0d381897da2..00000000000
Binary files a/static/css/fonts/OpenSans-Light.ttf and /dev/null differ
diff --git a/static/css/fonts/OpenSans-Light.woff b/static/css/fonts/OpenSans-Light.woff
deleted file mode 100644
index 937323df0d9..00000000000
Binary files a/static/css/fonts/OpenSans-Light.woff and /dev/null differ
diff --git a/static/css/fonts/OpenSans-Regular.ttf b/static/css/fonts/OpenSans-Regular.ttf
deleted file mode 100644
index db433349b70..00000000000
Binary files a/static/css/fonts/OpenSans-Regular.ttf and /dev/null differ
diff --git a/static/css/fonts/OpenSans-Regular.woff b/static/css/fonts/OpenSans-Regular.woff
deleted file mode 100644
index 2abc3ed69fd..00000000000
Binary files a/static/css/fonts/OpenSans-Regular.woff and /dev/null differ
diff --git a/static/css/styles.css b/static/css/styles.css
index 882bad4db8a..eb2d001d18d 100644
--- a/static/css/styles.css
+++ b/static/css/styles.css
@@ -1,40 +1,6 @@
 
 /*---- General ----*/
 
-/* enable to reveal boxes everywhere  */
-/** {
-    border-style: solid;
-    border-color: red;
- }*/
-
-@font-face {
-    font-family: 'Open Sans';
-    font-style: normal;
-    font-weight: normal;
-    src: local('Open Sans'), local('OpenSans'), url(fonts/OpenSans-Regular.woff) format('woff'), url(fonts/OpenSans-Regular.ttf) format('ttf');
-}
-
-@font-face {
-    font-family: 'Open Sans';
-    font-style: normal;
-    font-weight: bold;
-    src: local('Open Sans Semibold'), local('OpenSans-Semibold'), url(fonts/OpenSans-Semibold.woff) format('woff'), url(fonts/OpenSans-Semibold.ttf) format('ttf');
-}
-
-@font-face {
-    font-family: 'Open Sans';
-    font-style: italic;
-    font-weight: normal;
-    src: local('Open Sans Italic'), local('OpenSans-Italic'), url(fonts/OpenSans-Italic.woff) format('woff'), url(fonts/OpenSans-Bold.ttf) format('ttf');
-}
-
-@font-face {
-    font-family: 'Open Sans';
-    font-style: normal;
-    font-weight: light;
-    src: local('Open Sans Light'), local('OpenSans-Light'), url(fonts/OpenSans-Light.woff) format('woff'), url(fonts/OpenSans-Light.ttf) format('ttf');
-}
-
 @font-face {
   font-family: 'Glyphicons Halflings';
 
@@ -54,7 +20,7 @@ span.avoidwrap {
 
 /* Make background white, font grey and default buttons a bit darker to compensate */
 body {
-    font-family: 'Open Sans', Frutiger, Calibri, 'Myriad Pro', Myriad, sans-serif !important;
+    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Oxygen-Sans, Cantarell, Ubuntu, "Helvetica Neue", "Noto Sans", "Liberation Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
     color: #555;
     background: #fff;
 }