diff --git a/editions/tw5.com/tiddlywiki.info b/editions/tw5.com/tiddlywiki.info
index 781ce12a5..52d4072a7 100644
--- a/editions/tw5.com/tiddlywiki.info
+++ b/editions/tw5.com/tiddlywiki.info
@@ -11,6 +11,7 @@
 		"tiddlywiki/snowwhite",
 		"tiddlywiki/nighttime",
 		"tiddlywiki/starlight",
+		"tiddlywiki/seamless",
 		"tiddlywiki/stickytitles",
 		"tiddlywiki/centralised",
 		"tiddlywiki/readonly"
diff --git a/themes/tiddlywiki/seamless/base.tid b/themes/tiddlywiki/seamless/base.tid
new file mode 100644
index 000000000..51ad60e69
--- /dev/null
+++ b/themes/tiddlywiki/seamless/base.tid
@@ -0,0 +1,75 @@
+title: $:/themes/tiddlywiki/seamless/base
+tags: [[$:/tags/stylesheet]]
+
+\rules only filteredtranscludeinline transcludeinline macrodef macrocallinline
+
+.tw-page-controls button svg, .tw-tiddler-controls button svg, .tw-topbar button svg {
+	<<transition "fill 150ms ease-in-out">>
+}
+
+.tw-tiddler-controls button.tw-selected svg {
+	<<filter "drop-shadow(0px -1px 2px rgba(0,0,0,0.25))">>
+}
+
+.tw-drop-down {
+	border-radius: 4px;
+	<<box-shadow "2px 2px 10px rgba(0, 0, 0, 0.5)">>
+}
+
+.tw-block-dropdown {
+	border-radius: 4px;
+	<<box-shadow "2px 2px 10px rgba(0, 0, 0, 0.5)">>
+}
+
+.tw-modal-displayed {
+	-webkit-filter: blur(4px);
+}
+
+.modal {
+	border-radius: 6px;
+	<<box-shadow "0 3px 7px rgba(0,0,0,0.3)">>
+}
+
+.modal-footer {
+	border-radius: 0 0 6px 6px;
+	<<box-shadow "inset 0 1px 0 #fff">>;
+}
+
+.tw-alert {
+	border-radius: 6px;
+	<<box-shadow "0 3px 7px rgba(0,0,0,0.6)">>
+}
+
+.tw-notification {
+	border-radius: 6px;
+	<<box-shadow "0 3px 7px rgba(0,0,0,0.3)">>
+	text-shadow: 0 1px 0 rgba(255,255,255, 0.8);
+}
+
+.tw-message-box img {
+	<<box-shadow "1px 1px 3px rgba(0,0,0,0.5)">>
+}
+
+@media (min-width: {{$:/themes/tiddlywiki/vanilla/metrics##storywidth}}) {
+
+	body.tw-body .tw-tiddler-frame {
+		padding: 0;
+	}
+
+	body.tw-body .tw-sidebar-scrollable {
+		padding: 57px 0 28px 42px;
+	}
+
+}
+
+html body.tw-body {
+	background-color: <<colour background>>;
+}
+
+body.tw-body .tw-page-controls svg {
+	fill: <<colour muted-foreground>>;
+}
+
+body.tw-body .tw-sidebar-lists .tw-tab-buttons button.tw-tab-selected {
+	background-color: <<colour background>>;
+}
diff --git a/themes/tiddlywiki/seamless/plugin.info b/themes/tiddlywiki/seamless/plugin.info
new file mode 100644
index 000000000..7506619e8
--- /dev/null
+++ b/themes/tiddlywiki/seamless/plugin.info
@@ -0,0 +1,9 @@
+{
+	"title": "$:/themes/tiddlywiki/seamless",
+	"name": "Seamless",
+	"author": "JeremyRuston",
+	"core-version": ">=5.0.0",
+	"plugin-type": "theme",
+	"description": "Borderless tiddlers",
+	"dependents": ["$:/themes/tiddlywiki/vanilla"]
+}