Add dark mode for skin editor.

Http/SkinEditor/app.css

@@ -13,7 +13,6 @@ body {
 #toolbar {
 	height: 32px;
 	display: flex;
-    align-items: center;
 }
 
 .tgbtn {
@@ -192,17 +191,19 @@ input {
 	display: inline-block;
 }
 
+.t-internal {
+	background-color: lightgray;
+}
+
 /* Debug Mode */
 .mode-debug .t-internal {
 	display: block;
-    background-color: lightgray;
 	opacity: 0.6;
 }
 
 /* Sort Mode */
 .mode-sort .t-internal {
 	display: block;
-    background-color: lightgray;
 	opacity: 1;
 }
 
@@ -251,3 +252,36 @@ input {
 	margin: 0;
 	border: solid 1px green;
 }
+
+@media (prefers-color-scheme: dark) {
+	body {
+		background-color: black;
+		color: white;
+	}
+	.t-list {
+		background-color: darkslategray;
+	}
+	.t-li:hover {
+		background-color: darkblue;
+	}
+	input {
+		background-color: black;
+		color: white;
+	}
+	.tgbtn-active {
+		background-color: darkslateblue;
+	}
+	.tgbtn:hover {
+		background-color: gray;
+	}
+	.t-internal {
+		background-color: dimgray;
+	}
+	.mode-sort.state-grabbing .t-grabbing {
+		background-color: green;
+		border-left-color: lightgreen;
+	}
+	.grab-ptr {
+		border: solid 1px lightgreen;
+	}
+}