diff --git a/phpBB/styles/prosilver/template/overall_header.html b/phpBB/styles/prosilver/template/overall_header.html
index 5f38b332ce..1b48298307 100644
--- a/phpBB/styles/prosilver/template/overall_header.html
+++ b/phpBB/styles/prosilver/template/overall_header.html
@@ -29,6 +29,7 @@
 <!-- IF S_ALLOW_CDN --><link href="//fonts.googleapis.com/css?family=Open+Sans:600&amp;subset=latin,cyrillic-ext,latin-ext,cyrillic,greek-ext,greek,vietnamese" rel="stylesheet" type="text/css" media="screen, projection" /><!-- ENDIF -->
 <link href="{T_STYLESHEET_LINK}" rel="stylesheet" type="text/css" media="screen, projection" />
 <link href="{T_STYLESHEET_LANG_LINK}" rel="stylesheet" type="text/css" media="screen, projection" />
+<link href="{T_THEME_PATH}/responsive.css" rel="stylesheet" type="text/css" media="only screen and (max-width: 700px), only screen and (max-device-width: 700px)" />
 
 <!-- IF S_CONTENT_DIRECTION eq 'rtl' -->
 	<link href="{T_THEME_PATH}/bidi.css?assets_version={T_ASSETS_VERSION}" rel="stylesheet" type="text/css" media="screen, projection" />
diff --git a/phpBB/styles/prosilver/template/simple_header.html b/phpBB/styles/prosilver/template/simple_header.html
index b7b6bdd05e..309e1687b8 100644
--- a/phpBB/styles/prosilver/template/simple_header.html
+++ b/phpBB/styles/prosilver/template/simple_header.html
@@ -12,6 +12,7 @@
 <!-- IF S_ALLOW_CDN --><link href="//fonts.googleapis.com/css?family=Open+Sans:600&amp;subset=latin,cyrillic-ext,latin-ext,cyrillic,greek-ext,greek,vietnamese" rel="stylesheet" type="text/css" media="screen, projection" /><!-- ENDIF -->
 <link href="{T_STYLESHEET_LINK}" rel="stylesheet" type="text/css" media="screen, projection" />
 <link href="{T_STYLESHEET_LANG_LINK}" rel="stylesheet" type="text/css" media="screen, projection" />
+<link href="{T_THEME_PATH}/responsive.css" rel="stylesheet" type="text/css" media="only screen and (max-width: 700px), only screen and (max-device-width: 700px)" />
 
 <!-- IF S_CONTENT_DIRECTION eq 'rtl' -->
 	<link href="{T_THEME_PATH}/bidi.css?assets_version={T_ASSETS_VERSION}" rel="stylesheet" type="text/css" media="screen, projection" />
diff --git a/phpBB/styles/prosilver/theme/responsive.css b/phpBB/styles/prosilver/theme/responsive.css
new file mode 100644
index 0000000000..f4342479b2
--- /dev/null
+++ b/phpBB/styles/prosilver/theme/responsive.css
@@ -0,0 +1,2 @@
+/* Responsive Design
+---------------------------------------- */