diff --git a/src/Umbraco.Web.UI.Client/src/less/tuning.panelStyles.less b/src/Umbraco.Web.UI.Client/src/less/tuning.panelStyles.less
index f2f19a0f8b..6236240eee 100644
--- a/src/Umbraco.Web.UI.Client/src/less/tuning.panelStyles.less
+++ b/src/Umbraco.Web.UI.Client/src/less/tuning.panelStyles.less
@@ -1,10 +1,15 @@
+html {
+    height:100%;
+}
+
 body {
-        margin:0px;
-        padding:0px;
-	    text-align:center;
-        background-color:#fafbfd;
-        display:none;
-	}
+  display: none;
+  padding: 0;
+  margin: 0;
+  text-align: center;
+  background-color: #fafbfd;
+  height:100%;
+}
 
 .tuning #TuningBg {
   position: fixed;
@@ -31,7 +36,7 @@ body {
   height: 100%;
   padding: 0 5px 0 0;
   overflow-y: auto;
-  text-align:left;
+  text-align: left;
 }
 
 .tuning #TuningBg.open {
@@ -94,7 +99,7 @@ body {
 }
 
 .tuning .panel-title > a span {
-    display:block;
+  display: block;
 }
 
 .tuning .panel-title > a:hover {
@@ -426,7 +431,7 @@ body {
 }
 
 .tuning .palette li {
-  margin: 10px 0 0 0px;
+  margin: 10px 0 0 0;
   overflow: hidden;
   clear: both;
   cursor: pointer;
@@ -531,47 +536,48 @@ i.small {
   content: "\e121";
 }
 
-.icon-iphone:before{content:"\e0f1"}
+.icon-iphone:before {
+  content: "\e0f1";
+}
 
 /******* IFRAME *******/
 
 .desktop {
-    margin:0px auto;
-    width: 100%; 
-    height: 100%;
+  width: 100%;
+  height: 100%;
+  margin: 0 auto;
 }
 
 .tablet {
-    width: 1040px; 
-    height: 757px;
-    margin:75px auto;
-    opacity: 1.0;
-    border-radius: 10px;
-    transition: all 0.5s ease-in-out;
-    box-shadow: 0 0 0 29px #fff, 0 0 0 30px #dee0e3;
-    background-color:#ffffff;
+  width: 1040px;
+  height: 757px;
+  margin: 75px auto;
+  background-color: #ffffff;
+  border-radius: 10px;
+  opacity: 1.0;
+  box-shadow: 0 0 0 29px #fff, 0 0 0 30px #dee0e3;
+  transition: all 0.5s ease-in-out;
 }
 
-
 .mobile {
-    width: 350px; 
-    height: 568px;
-    margin:75px auto;
-    opacity: 1.0;
-    border-radius: 10px;
-    transition: all 0.5s ease-in-out;
-    box-shadow: 0 0 0 29px #fff, 0 0 0 30px #dee0e3;
-    background-color:#ffffff;
+  width: 350px;
+  height: 568px;
+  margin: 75px auto;
+  background-color: #ffffff;
+  border-radius: 10px;
+  opacity: 1.0;
+  box-shadow: 0 0 0 29px #fff, 0 0 0 30px #dee0e3;
+  transition: all 0.5s ease-in-out;
 }
 
 iframe {
-    overflow:hidden;
-    overflow-x:hidden;
-    overflow-y:hidden;
-    height:100%;
-    width:100%;
-    top:0px;
-    left:0px;
-    right:0px;
-    bottom:0px
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  overflow: hidden;
+  overflow-x: hidden;
+  overflow-y: hidden;
 }
\ No newline at end of file