diff --git a/web/viewer.css b/web/viewer.css
index 2d2864551..329bff2d5 100644
--- a/web/viewer.css
+++ b/web/viewer.css
@@ -1066,3 +1066,10 @@ canvas {
     display: none;
   }
 }
+
+@media all and (max-width: 500px) {
+  #scaleSelectContainer, #pageNumberLabel {
+    display: none;
+  }
+}
+
diff --git a/web/viewer.html b/web/viewer.html
index 56522478e..f76c3665f 100644
--- a/web/viewer.html
+++ b/web/viewer.html
@@ -2,6 +2,7 @@
 <html dir="ltr">
   <head>
     <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
     <title>PDF.js viewer</title>
     <!-- PDFJSSCRIPT_INCLUDE_FIREFOX_EXTENSION -->
 
