diff --git a/themes/tiddlywiki/centralised/styles.tid b/themes/tiddlywiki/centralised/styles.tid
index 5f979826e..4ef4ba7c7 100644
--- a/themes/tiddlywiki/centralised/styles.tid
+++ b/themes/tiddlywiki/centralised/styles.tid
@@ -3,7 +3,7 @@ tags: [[$:/tags/stylesheet]]
 
 \rules only filteredtranscludeinline transcludeinline macrodef macrocallinline
 
-@media (min-width: 55em) {
+@media (min-width: 770px) {
 
 	.tw-page-container {
 		text-align: center;
@@ -11,8 +11,8 @@ tags: [[$:/tags/stylesheet]]
 
 	.story-river {
 		position: relative;
-		width: 55em;
-		padding: 3em;
+		width: 770px;
+		padding: 42px;
 		margin: 0 auto;
 		text-align: left;
 	}
@@ -21,6 +21,6 @@ tags: [[$:/tags/stylesheet]]
 		text-align: left;
 		left: 50%;
 		right: 0;
-		padding-left: 29.5em;
+		padding-left: 413px;
 	}
 }
diff --git a/themes/tiddlywiki/snowwhite/base.tid b/themes/tiddlywiki/snowwhite/base.tid
index 2b6d3211a..3a207146c 100644
--- a/themes/tiddlywiki/snowwhite/base.tid
+++ b/themes/tiddlywiki/snowwhite/base.tid
@@ -94,8 +94,8 @@ code {
 
 pre {
 	display: block;
-	padding: 1em;
-	margin: 0 0 1em;
+	padding: 14px;
+	margin: 0 0 14px;
 	word-break: break-all;
 	word-wrap: break-word;
 	white-space: pre;
@@ -112,7 +112,7 @@ table {
 }
 
 table th, table td {
-	padding: 0 0.5em 0 0.5em;
+	padding: 0 7px 0 7px;
 	border-top: 1px solid #ddd;
 	border-left: 1px solid #ddd;
 }
@@ -132,7 +132,7 @@ table tfoot tr td {
 
 embed {
 	max-width: 100%;
-	height: 20em;
+	max-height: 280px;
 }
 
 /*
@@ -259,11 +259,11 @@ a.tw-tiddlylink-external {
 
 .tw-tag-list-item {
 	display: inline-block;
-	margin-right: 0.5em;
+	margin-right: 7px;
 }
 
 .tw-tags-wrapper {
-	margin: 0.25em 0 1em 0;
+	margin: 4px 0 14px 0;
 }
 
 .tw-missing-tiddler-label {
@@ -279,9 +279,9 @@ a.tw-tiddlylink-external {
 .tw-tag-label {
 	display: inline-block;
 	padding: 2px 9px;
-	font-size: 11.844px;
+	font-size: 0.9em;
 	font-weight: 300;
-	line-height: 14px;
+	line-height: 1.2em;
 	color: #fff;
 	white-space: nowrap;
 	vertical-align: baseline;
@@ -309,8 +309,8 @@ a.tw-tiddlylink-external {
 }
 
 .sidebar-header .tw-sidebar-lists p {
-	margin-top: 0.2em;
-	margin-bottom: 0.2em;
+	margin-top: 3px;
+	margin-bottom: 3px;
 }
 
 .tw-search a svg {
@@ -318,11 +318,11 @@ a.tw-tiddlylink-external {
 }
 
 .tw-search-results {
-	padding-top: 1em;
+	padding-top: 14px;
 }
 
 .tw-page-controls {
-	margin-top: 1em;
+	margin-top: 14px;
 }
 
 .tw-page-controls a.tw-tiddlylink:hover {
@@ -356,12 +356,12 @@ a.tw-tiddlylink-external {
 }
 
 .tw-menu-list-subitem {
-	padding-left: 0.5em;
+	padding-left: 7px;
 }
 
 @media (max-width: {{$:/themes/tiddlywiki/snowwhite/metrics##storywidth}}) {
 	.sidebar-header {
-		padding: 1em;
+		padding: 14px;
 	}
 
 	.story-river {
@@ -379,8 +379,8 @@ a.tw-tiddlylink-external {
 		overflow-y: auto;
 		overflow-x: auto;
 		-webkit-overflow-scrolling: touch;
-		margin: 0 0 0 -3em;
-		padding: 6em 0 2em 3em;
+		margin: 0 0 0 -42px;
+		padding: 84px 0 28px 42px;
 	}
 
 	.story-river {
@@ -388,7 +388,7 @@ a.tw-tiddlylink-external {
 		left: {{$:/themes/tiddlywiki/snowwhite/metrics##storyleft}};
 		top: {{$:/themes/tiddlywiki/snowwhite/metrics##storytop}};
 		width: {{$:/themes/tiddlywiki/snowwhite/metrics##storywidth}};
-		padding: 3em;
+		padding: 42px;
 	}
 }
 
@@ -398,7 +398,7 @@ a.tw-tiddlylink-external {
 	}
 
 	.story-river {
-		margin-left: 1em;
+		margin-left: 14px;
 	}
 }
 
@@ -407,13 +407,13 @@ a.tw-tiddlylink-external {
 */
 
 .tw-tiddler-frame {
-	margin-bottom: 2em;
+	margin-bottom: 28px;
 	background-color: {{$:/themes/tiddlywiki/snowwhite/colourmappings##tiddlerbackground}};
 }
 
 .tw-tiddler-info {
 	overflow: hidden;
-	padding: 1em 3em 1em 3em;
+	padding: 14px 42px 14px 42px;
 	background-color: #f8f8f8;
 	border-top: 1px solid #ddd;
 	border-bottom: 1px solid #ddd;
@@ -439,30 +439,30 @@ a.tw-tiddlylink-external {
 	}
 }
 
-@media (max-width: 55em) {
+@media (max-width: 77px) {
 	.tw-tiddler-frame {
-		padding: 1em 1em 1em 1em;
+		padding: 14px 14px 14px 14px;
 	}
 
 	.tw-tiddler-info {
-		margin: 0 -1em 0 -1em;
+		margin: 0 -14px 0 -14px;
 	}
 }
 
-@media (min-width: 55em) {
+@media (min-width: 77px) {
 	.tw-tiddler-frame {
-		padding: 2em 3em 3em 3em;
+		padding: 28px 42px 42px 42px;
 	}
 
 	.tw-tiddler-info {
-		margin: 0 -3em 0 -3em;
+		margin: 0 -42px 0 -42px;
 	}
 }
 
 .title {
 	font-weight: 300;
-	font-size: 33px;
-	line-height: 40px;
+	font-size: 2.35em;
+	line-height: 1.2em;
 	color: #182955;
 }
 
@@ -486,7 +486,7 @@ a.tw-tiddlylink-external {
 }
 
 .tw-tiddler-controls .tw-button {
-	margin: 0 0 0 0.33em;
+	margin: 0 0 0 5px;
 	vertical-align: baseline;
 }
 
@@ -508,7 +508,7 @@ a.tw-tiddlylink-external {
 
 .tw-tiddler-help { /* Help prompts within tiddler template */
 	color: #999;
-	margin-top: 1em;
+	margin-top: 14px;
 }
 
 .tw-tiddler-help a.tw-tiddlylink {
@@ -521,7 +521,7 @@ a.tw-tiddlylink-external {
 	border: 1px solid #ccc;
 	line-height: 1.3em;
 	-webkit-appearance: none;
-	margin: 0.25em 0 0.25em 0;
+	margin: 4px 0 4px 0;
 }
 
 .tw-tiddler-frame .tw-edit-texteditor input {
@@ -550,12 +550,12 @@ canvas.tw-edit-bitmapeditor  {
 */
 
 .tw-edit-tags-list {
-	margin: 1em 0 1em 0;
+	margin: 14px 0 14px 0;
 }
 
 .tw-tag-editor-label {
 	display: inline-block;
-	margin-right: 0.5em;
+	margin-right: 7px;
 }
 
 .tw-remove-tag-button {
@@ -568,20 +568,20 @@ canvas.tw-edit-bitmapeditor  {
 
 .tw-tags-autocomplete {
 	position: absolute;
-	min-width: 20em;
+	min-width: 280px;
 	border: 1px solid {{$:/themes/tiddlywiki/snowwhite/colourmappings##dropdownborder}};
 	background-color: {{$:/themes/tiddlywiki/snowwhite/colourmappings##dropdownbackground}};
 	<<border-radius 4px>>
 	<<box-shadow "2px 2px 10px rgba(0, 0, 0, 0.5)">>
 	padding: 0 0 0 0;
-	margin: 0.25em 0 0 0;
+	margin: 4px 0 0 0;
 	white-space: nowrap;
 	z-index: 1000;
 }
 
 .tw-tags-autocomplete a {
 	display: block;
-	padding: 0.25em 1em 0.25em 1em;
+	padding: 4px 14px 4px 14px;
 }
 
 .tw-tags-autocomplete a:hover {
@@ -671,19 +671,19 @@ canvas.tw-edit-bitmapeditor  {
 */
 
 .tw-drop-down {
-	min-width: 20em;
+	min-width: 280px;
 	border: 1px solid {{$:/themes/tiddlywiki/snowwhite/colourmappings##dropdownborder}};
 	background-color: {{$:/themes/tiddlywiki/snowwhite/colourmappings##dropdownbackground}};
 	<<border-radius 4px>>
 	<<box-shadow "2px 2px 10px rgba(0, 0, 0, 0.5)">>
-	padding: 0.5em 0em 0.5em 0em;
-	margin: 0.25em 0 0 0;
+	padding: 7px 0 7px 0;
+	margin: 4px 0 0 0;
 	white-space: nowrap;
 }
 
 .tw-drop-down a {
 	display: block;
-	padding: 0em 1em 0em 1em;
+	padding: 0 14px 0 14px;
 }
 
 .tw-drop-down a:hover {
@@ -790,11 +790,11 @@ canvas.tw-edit-bitmapeditor  {
 
 .tw-notification {
 	position: fixed;
-	top: 1em;
-	right: 1em;
+	top: 14px;
+	right: 14px;
 	z-index: 1000;
-	max-width: 20em;
-	padding: 0em 1em 0em 1em;
+	max-width: 280px;
+	padding: 0 14px 0 14px;
 	background-color: #ffd;
 	border: 1px solid #999;
 	border: 1px solid rgba(0,0,0,.3);
@@ -824,8 +824,8 @@ canvas.tw-edit-bitmapeditor  {
 	border-top: 1px solid #bbb;
 	border-right: 1px solid #bbb;
 	border-bottom: 1px solid #bbb;
-	margin-left: 0.25em;
-	margin-right: 0.25em;
+	margin-left: 4px;
+	margin-right: 4px;
 	font-weight: 300;
 }
 
@@ -839,7 +839,7 @@ canvas.tw-edit-bitmapeditor  {
 }
 
 .tw-tab-content {
-	padding-top: 1em;
+	padding-top: 14px;
 }
 
 .tw-sidebar-tab-divider.tw-tab-divider {
@@ -852,9 +852,9 @@ canvas.tw-edit-bitmapeditor  {
 	white-space: nowrap;
 }
 
-@media (min-width: 55em) {
+@media (min-width: 770px) {
 	.tw-more-sidebar.tw-tab-set {
-		margin-left: -1em;
+		margin-left: -14px;
 	}
 }
 
@@ -862,15 +862,15 @@ canvas.tw-edit-bitmapeditor  {
 	display: inline-block;
 	vertical-align: top;
 	text-align: right;
-	padding-top: 0em;
-	padding-left: 0em;
+	padding-top: 0;
+	padding-left: 0;
 }
 
 .tw-more-sidebar .tw-tab-content {
 	display: inline-block;
 	vertical-align: top;
-	padding-top: 0em;
-	padding-left: 1em;
+	padding-top: 0;
+	padding-left: 14px;
 }
 
 .tw-more-sidebar .tw-tab-buttons button {
@@ -894,14 +894,14 @@ canvas.tw-edit-bitmapeditor  {
 
 .tw-alert {
 	<<border-radius 6px>>
-	margin: 0.5em 0.5em 0.5em 0.5em;
-	padding: 1em 1em 1em 1em;
+	margin: 7px 7px 7px 7px;
+	padding: 14px 14px 14px 14px;
 	border: 3px solid #DBB727;
 	background-color: rgb(250, 210, 50);
 }
 
 .tw-static-alert {
-	padding: 0em 0.2em 0.2em 3em;
+	padding: 0 2px 2px 42px;
 	color: #AAA;
 }
 
diff --git a/themes/tiddlywiki/snowwhite/metrics.tid b/themes/tiddlywiki/snowwhite/metrics.tid
index a284e34cf..b4d40cedb 100644
--- a/themes/tiddlywiki/snowwhite/metrics.tid
+++ b/themes/tiddlywiki/snowwhite/metrics.tid
@@ -3,7 +3,7 @@ type: application/x-tiddler-dictionary
 
 fontsize: `14px`
 lineheight: `20px`
-storyleft: `0em`
-storytop: `0em`
-storyright: `55em`
-storywidth: `55em`
+storyleft: `0px`
+storytop: `0px`
+storyright: `770px`
+storywidth: `770px`