clean up css color scheme stuff a bit

static/css/colors.css

@@ -1,6 +1,4 @@
-@media not all and (prefers-color-scheme: dark) {
 :root {
-        color-scheme: light;
     --success-primary: #060;
     --success-secondary: #0a0;
     --failure-primary: #d00;
@@ -25,11 +23,9 @@
     --button-disabled-background: #eee;
     --button-disabled-border: #ddd;
 }
-}
 
 @media (prefers-color-scheme: dark) {
     :root {
-        color-scheme: dark;
         --success-primary: #0d0;
         --success-secondary: #080;
         --failure-primary: #f34;

static/css/transbeam.css

@@ -9,6 +9,7 @@ body {
 
 #header h1 {
     margin-top: 5px;
+    color: CanvasText;
 }
 
 #header a {