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diff --git a/learn/rwd/flex-based-rwd.html b/learn/rwd/flex-based-rwd.html
index 214c12ae..ef51b533 100644
--- a/learn/rwd/flex-based-rwd.html
+++ b/learn/rwd/flex-based-rwd.html
@@ -2,6 +2,7 @@
 <html lang="en">
 <head>
     
+    <meta name="viewport" content="width=device-width, initial-scale=1">
     <title>A simple flexbox-based responsive design</title>
     <style>
</style>
       body {
diff --git a/learn/rwd/grid-based-rwd.html b/learn/rwd/grid-based-rwd.html
index 27a4c256..6d250005 100644
--- a/learn/rwd/grid-based-rwd.html
+++ b/learn/rwd/grid-based-rwd.html
@@ -2,6 +2,7 @@
 <html lang="en">
 <head>
     
+    <meta name="viewport" content="width=device-width, initial-scale=1">
     <title>A simple grid-based responsive design</title>
     <style>
</style>
       body {
