diff --git a/copyparty/web/browser.css b/copyparty/web/browser.css
index 7f0d0ff7..dff3abad 100644
--- a/copyparty/web/browser.css
+++ b/copyparty/web/browser.css
@@ -685,3 +685,169 @@ input[type="checkbox"]:checked+label {
 	font-family: monospace, monospace;
 	line-height: 2em;
 }
+
+
+
+
+
+html.light {
+	color: #333;
+	background: #eee;
+	text-shadow: none;
+}
+html.light #ops,
+html.light .opbox,
+html.light #srch_form {
+	background: #f7f7f7;
+	box-shadow: 0 0 .3em #ddd;
+	border-color: #f7f7f7;
+}
+html.light #ops a.act {
+	box-shadow: 0 .2em .2em #ccc;
+	background: #f7f7f7;
+	border-color: #07a;
+	padding-top: .4em;
+}
+html.light #op_cfg h3 {
+	border-color: #ccc;
+}
+html.light .tglbtn,
+html.light #tree > a + a {
+	color: #666;
+	background: #ddd;
+	box-shadow: none;
+}
+html.light .tglbtn:hover,
+html.light #tree > a + a:hover {
+	background: #caf;
+}
+html.light .tglbtn.on,
+html.light #tree > a + a.on {
+	background: #4a0;
+	color: #fff;
+}
+html.light #srv_info {
+	color: #c83;
+	text-shadow: 1px 1px 0 #fff;
+}
+html.light #srv_info span {
+	color: #000;
+}
+html.light #treeul a+a {
+	background: inherit;
+	color: #06a;
+}
+html.light #treeul a.hl {
+	background: #07a;
+	color: #fff;
+}
+html.light #tree li {
+	border-color: #ddd #fff #f7f7f7 #fff;
+}
+html.light #tree ul {
+	border-color: #ccc;
+}
+html.light a,
+html.light #ops a,
+html.light #files tbody div a:last-child {
+	color: #06a;
+}
+html.light #files tbody {
+	background: #f7f7f7;
+}
+html.light #files {
+	box-shadow: 0 0 .3em #ccc;
+}
+html.light #files thead th {
+	background: #eee;
+}
+html.light #files tr+tr td {
+	border-top: 1px solid #ddd;
+}
+html.light #files td {
+	border-bottom: 1px solid #f7f7f7;
+}
+html.light #files tbody tr:last-child td {
+	border-bottom: .2em solid #ccc;
+}
+html.light #files td:nth-child(2n) {
+	color: #d38;
+}
+html.light #files tr:hover td {
+	background: #fff;
+}
+html.light #files tbody a.play {
+	color: #c0f;
+}
+html.light #files tr.play td {
+	background: #fc5;
+}
+html.light #files tr.play a {
+	color: #406;
+}
+html.light #files > thead > tr > th.min span {
+	background: linear-gradient(90deg, rgba(68,68,68,0), rgba(68,68,68,0.2) 70%, rgba(68,68,68,0.5));
+}
+html.light #blocked {
+	background: #eee;
+}
+html.light #blk_play a,
+html.light #blk_abrt a {
+	background: #fff;
+	box-shadow: 0 .2em .4em #ddd;
+}
+html.light #widget a {
+	color: #fc5;
+}
+html.light #files tr.sel:hover td {
+	background: #c37;
+}
+html.light #files tr.sel a {
+	color: #fff;
+}
+html.light input[type="checkbox"] + label {
+	color: #333;
+}
+.opview input[type="text"] {
+	background: #fff;
+	color: #333;
+	box-shadow: 0 0 2px #888;
+	border-color: #d38;
+}
+html.light #ops:hover #opdesc {
+	background: #fff;
+	box-shadow: 0 .3em 1em #ccc;
+}
+html.light #opdesc code {
+	background: #060;
+	color: #fff;
+}
+html.light #u2tab a>span,
+html.light #files td div span {
+	color: #000;
+}
+html.light #files a:hover {
+	color: #000;
+	background: #fff;
+}
+html.light #path {
+	background: #f7f7f7;
+	text-shadow: none;
+	box-shadow: 0 0 .3em #bbb;
+}
+html.light #path a {
+	color: #333;
+}
+html.light #path a:not(:last-child)::after {
+	border-color: #ccc;
+	background: none;
+	border-width: .1em .1em 0 0;
+	margin: -.2em .3em -.2em -.3em;
+}
+html.light #path a:hover {
+	background: none;
+	color: #60a;
+}
+html.light #files tbody div a {
+	color: #d38;
+}
\ No newline at end of file
diff --git a/copyparty/web/browser.html b/copyparty/web/browser.html
index 01c15209..541c6202 100644
--- a/copyparty/web/browser.html
+++ b/copyparty/web/browser.html
@@ -39,14 +39,17 @@
     {%- include 'upload.html' %}
 
     <div id="op_cfg" class="opview opbox">
-        <h3>key notation</h3>
-        <div id="key_notation"></div>
+        <h3>switches</h3>
+        <div>
+            <a id="tooltips" class="tglbtn" href="#">tooltips</a>
+            <a id="lightmode" class="tglbtn" href="#">lightmode</a>
+        </div>
         {%- if have_zip %}
         <h3>folder download</h3>
         <div id="arc_fmt"></div>
         {%- endif %}
-        <h3>tooltips</h3>
-        <div><a id="tooltips" class="tglbtn" href="#">enable</a></div>
+        <h3>key notation</h3>
+        <div id="key_notation"></div>
     </div>
     
     <h1 id="path">
diff --git a/copyparty/web/browser.js b/copyparty/web/browser.js
index 2a4f3d62..ace69031 100644
--- a/copyparty/web/browser.js
+++ b/copyparty/web/browser.js
@@ -1577,6 +1577,24 @@ function addcrc() {
 })();
 
 
+(function () {
+	var light = bcfg_get('lightmode', false);
+
+	function freshen() {
+		document.documentElement.setAttribute("class", light ? "light" : "");
+	}
+
+	ebi('lightmode').onclick = function (e) {
+		ev(e);
+		light = !light;
+		bcfg_set('lightmode', light);
+		freshen();
+	};
+
+	freshen();
+})();
+
+
 var arcfmt = (function () {
 	if (!ebi('arc_fmt'))
 		return { "render": function () { } };
diff --git a/copyparty/web/md.html b/copyparty/web/md.html
index 457d56d3..171d0dd8 100644
--- a/copyparty/web/md.html
+++ b/copyparty/web/md.html
@@ -138,10 +138,10 @@ var md_opt = {
         document.documentElement.setAttribute("class", dark ? "dark" : "");
         btn.innerHTML = "go " + (dark ? "light" : "dark");
         if (window.localStorage)
-            localStorage.setItem('darkmode', dark ? 1 : 0);
+            localStorage.setItem('lightmode', dark ? 0 : 1);
     };
     btn.onclick = toggle;
-    if (window.localStorage && localStorage.getItem('darkmode') == 1)
+    if (window.localStorage && localStorage.getItem('lightmode') != 1)
 		toggle();
 })();
 
diff --git a/copyparty/web/mde.html b/copyparty/web/mde.html
index e88c297f..eaf3fa3b 100644
--- a/copyparty/web/mde.html
+++ b/copyparty/web/mde.html
@@ -31,12 +31,12 @@ var md_opt = {
 
 var lightswitch = (function () {
 	var fun = function () {
-		var dark = !!!document.documentElement.getAttribute("class");
+		var dark = !document.documentElement.getAttribute("class");
 		document.documentElement.setAttribute("class", dark ? "dark" : "");
 		if (window.localStorage)
-			localStorage.setItem('darkmode', dark ? 1 : 0);
+			localStorage.setItem('lightmode', dark ? 0 : 1);
 	};
-	if (window.localStorage && localStorage.getItem('darkmode') == 1)
+	if (window.localStorage && localStorage.getItem('lightmode') != 1)
 		fun();
 	
 	return fun;
diff --git a/copyparty/web/splash.html b/copyparty/web/splash.html
index cec763ce..d59e18eb 100644
--- a/copyparty/web/splash.html
+++ b/copyparty/web/splash.html
@@ -38,7 +38,7 @@
     </div>
     <script>
 
-if (window.localStorage && localStorage.getItem('darkmode') == 1)
+if (window.localStorage && localStorage.getItem('lightmode') != 1)
     document.documentElement.setAttribute("class", "dark");
 
 </script>
diff --git a/copyparty/web/up2k.js b/copyparty/web/up2k.js
index a982b525..23e920ed 100644
--- a/copyparty/web/up2k.js
+++ b/copyparty/web/up2k.js
@@ -1333,14 +1333,14 @@ function up2k_init(have_crypto) {
 
         var obj = ebi('nthread');
         if (dir.target) {
-            obj.style.background = '#922';
+            clmod(obj, 'err', 1);
             var v = Math.floor(parseInt(obj.value));
             if (v < 1 || v > 8 || v !== v)
                 return;
 
             parallel_uploads = v;
             swrite('nthread', v);
-            obj.style.background = '#444';
+            clmod(obj, 'err');
             return;
         }
 
diff --git a/copyparty/web/upload.css b/copyparty/web/upload.css
index 8b52ea57..40278f2d 100644
--- a/copyparty/web/upload.css
+++ b/copyparty/web/upload.css
@@ -141,6 +141,9 @@
 	font-size: 1.2em;
 	padding: .15em 0;
 }
+#u2conf .txtbox.err {
+	background: #922;
+}
 #u2conf a {
 	color: #fff;
 	background: #c38;
@@ -238,3 +241,35 @@
 	float: right;
 	margin-bottom: -.3em;
 }
+
+
+
+
+
+html.light #u2btn {
+	box-shadow: .4em .4em 0 #ccc;
+}
+html.light #u2cards span {
+	color: #000;
+}
+html.light #u2cards a {
+	background: linear-gradient(to bottom, #eee, #fff);
+}
+html.light #u2cards a.act {
+	background: inherit;
+}
+html.light #u2conf .txtbox {
+	background: #fff;
+	color: #444;
+}
+html.light #u2conf .txtbox.err {
+	background: #f96;
+	color: #300;
+}
+html.light #u2cdesc {
+	background: #fff;
+	border: none;
+}
+html.light #op_up2k.srch #u2btn {
+	border-color: #a80;
+}
\ No newline at end of file