Fix the prose-mirror's light theme styling

styles/Apps/PlayerSheet.css

@@ -43,7 +43,6 @@
 
 	prose-mirror {
 		height: 100%;
-		background: var(--color-cool-5);
 
 		menu {
 			border-bottom-left-radius: 0;

styles/elements/prose-mirror.css

@@ -1,4 +1,6 @@
 .taf > .window-content prose-mirror {
+	background: var(--prosemirror-background);
+
 	.editor-content {
 		padding: 0 8px 8px;
 	}

styles/main.css

@@ -1,6 +1,8 @@
-@layer resets, elements, components, partials, apps, exceptions;
+@layer resets, themes, elements, components, partials, apps, exceptions;
 
-/* Resets */
+/* Themes */
+@import url("./themes/dark.css") layer(themes);
+@import url("./themes/light.css") layer(themes);
 
 /* Elements */
 @import url("./elements/headers.css") layer(elements);

styles/themes/dark.css

@@ -0,0 +1,3 @@
+.theme-dark {
+	--prosemirror-background: var(--color-cool-5);
+}

styles/themes/light.css

@@ -0,0 +1,3 @@
+.theme-light {
+	--prosemirror-background: white;
+}