diff --git a/ckan/public/base/css/main.css b/ckan/public/base/css/main.css
index 9b454097752..c686d0f8da1 100644
--- a/ckan/public/base/css/main.css
+++ b/ckan/public/base/css/main.css
@@ -4480,10 +4480,6 @@ ul.icons li .icon-large:before {
   right: -11px;
   width: 11px;
 }
-.unstyled {
-  margin: 0;
-  list-style: none;
-}
 .simple-item {
   font-size: 12px;
   line-height: 1.1666666666666667em;
@@ -4506,13 +4502,13 @@ ul.icons li .icon-large:before {
 .simple-list:after {
   clear: both;
 }
-.simple-list  > li {
+.simple-list > li {
   font-size: 12px;
   line-height: 1.1666666666666667em;
   padding: 7px 25px;
   border-bottom: 1px dotted #cccccc;
 }
-.simple-list  > li:last-of-type {
+.simple-list > li:last-of-type {
   border-bottom: 0;
 }
 .simple-list .ckan-icon {
@@ -4663,8 +4659,6 @@ ul.icons li .icon-large:before {
   padding-right: 15px;
 }
 .module-grid {
-  margin: 0;
-  list-style: none;
   margin: 0;
   list-style: none;
   *zoom: 1;
@@ -4688,7 +4682,6 @@ ul.icons li .icon-large:before {
   padding-left: 20px;
   padding-bottom: 25px;
   float: left;
-  float: left;
   margin-left: 20px;
   width: 460px;
   padding-top: 10px;
@@ -4711,6 +4704,17 @@ ul.icons li .icon-large:before {
 .group-listing {
   margin-left: -20px;
 }
+.ckanext-datapreview {
+  position: relative;
+}
+.ckanext-datapreview > iframe {
+  min-height: 400px;
+}
+.ckanext-datapreview > img {
+  max-height: 500px;
+  max-width: 100%;
+  overflow: hidden;
+}
 .media {
   position: relative;
   overflow: hidden;
@@ -4867,13 +4871,13 @@ ol.media-grid:after {
 .nav-simple:after {
   clear: both;
 }
-.nav-simple  > li {
+.nav-simple > li {
   font-size: 12px;
   line-height: 1.1666666666666667em;
   padding: 7px 25px;
   border-bottom: 1px dotted #cccccc;
 }
-.nav-simple  > li:last-of-type {
+.nav-simple > li:last-of-type {
   border-bottom: 0;
 }
 .nav-simple .ckan-icon {
@@ -4895,12 +4899,10 @@ ol.media-grid:after {
 }
 .nav-item.active > a {
   background: url("../../../base/images/background-tag.png") no-repeat -13px center;
-  position: relative;
   display: block;
   font-size: 11px;
   line-height: 27px;
   color: #005772;
-  padding-left: 10px;
   padding-right: 5px;
   margin-right: 11px;
   -webkit-box-sizing: border-box;
@@ -5025,6 +5027,10 @@ input[type=checkbox] {
   padding: 0;
   margin: 0;
 }
+input[type=radio].checkbox-onown,
+input[type=checkbox].checkbox-onown {
+  top: 0;
+}
 select {
   margin-top: 6px;
   padding: 4px;
@@ -5185,8 +5191,6 @@ textarea {
   background-image: url("../../../base/images/sprite-ckan-icons.png");
   background-repeat: no-repeat;
   background-position: 16px 16px;
-  width: 17px;
-  height: 17px;
   background-position: -51px -16px;
   position: absolute;
   display: block;
@@ -5772,8 +5776,6 @@ textarea {
   vertical-align: text-bottom;
   position: relative;
   top: 2px;
-  width: 16px;
-  height: 16px;
   background-image: url("../../../base/images/sprite-ckan-icons.png");
   background-repeat: no-repeat;
   background-position: 16px 16px;
@@ -6596,7 +6598,6 @@ li .icon-large:before {
   float: right;
 }
 [role=main] .secondary {
-  float: left;
   margin-left: 20px;
   width: 220px;
   margin-left: 0;
@@ -6832,13 +6833,11 @@ li .icon-large:before {
   bottom: NaN;
   width: 1px;
   background-color: #007094;
-  background-color: rgba(255, 255, 255, 0);
   background-image: -webkit-gradient(radial, center center, 0, center center, 460, from(rgba(255, 255, 255, 0.1)), to(rgba(255, 255, 255, 0)));
   background-image: -webkit-radial-gradient(circle, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0));
   background-image: -moz-radial-gradient(circle, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0));
   background-image: -ms-radial-gradient(circle, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0));
   background-image: -o-radial-gradient(circle, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0));
-  background-repeat: no-repeat;
   background-color: rgba(255, 255, 255, 0.08000000000000002);
   background-image: -webkit-gradient(linear, 0 0, 0 100%, from(rgba(255, 255, 255, 0)), color-stop(0.5, rgba(255, 255, 255, 0.1)), to(rgba(255, 255, 255, 0)));
   background-image: -webkit-linear-gradient(rgba(255, 255, 255, 0), rgba(255, 255, 255, 0.1) 0.5, rgba(255, 255, 255, 0));
@@ -6852,13 +6851,11 @@ li .icon-large:before {
 .masthead .section:after {
   left: -1px;
   background-color: #004a61;
-  background-color: rgba(0, 0, 0, 0);
   background-image: -webkit-gradient(radial, center center, 0, center center, 460, from(rgba(0, 0, 0, 0.2)), to(rgba(0, 0, 0, 0)));
   background-image: -webkit-radial-gradient(circle, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0));
   background-image: -moz-radial-gradient(circle, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0));
   background-image: -ms-radial-gradient(circle, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0));
   background-image: -o-radial-gradient(circle, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0));
-  background-repeat: no-repeat;
   background-color: rgba(0, 0, 0, 0.16000000000000003);
   background-image: -webkit-gradient(linear, 0 0, 0 100%, from(rgba(0, 0, 0, 0)), color-stop(0.5, rgba(0, 0, 0, 0.2)), to(rgba(0, 0, 0, 0)));
   background-image: -webkit-linear-gradient(rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.2) 0.5, rgba(0, 0, 0, 0));
@@ -7247,6 +7244,42 @@ iframe {
 .page-heading {
   margin-bottom: 16px;
 }
+.m-top {
+  margin-top: 15px;
+}
+.m-left {
+  margin-left: 15px;
+}
+.m-right {
+  margin-right: 15px;
+}
+.m-bottom {
+  margin-bottom: 15px;
+}
+.no-margin {
+  margin: 0;
+}
+.reduced-margin {
+  margin: 3px 5px;
+}
+.p-top {
+  padding-top: 15px;
+}
+.p-left {
+  padding-left: 15px;
+}
+.p-right {
+  padding-right: 15px;
+}
+.p-bottom {
+  padding-bottom: 15px;
+}
+.no-padding {
+  padding: 0;
+}
+.reduced-padding {
+  padding: 3px 5px;
+}
 .ie .lang-dropdown {
   position: relative;
   top: -20px;
diff --git a/ckan/public/base/less/mixins.less b/ckan/public/base/less/mixins.less
index fa429a5a548..935cb3dbaca 100644
--- a/ckan/public/base/less/mixins.less
+++ b/ckan/public/base/less/mixins.less
@@ -73,7 +73,7 @@
   }
 }
 
-.unstyled {
+.unstyled() {
   margin: 0;
   list-style: none;
 }