style: update chat ui design

src/main/resources/ui-structure/casinogameui.css

@@ -11,24 +11,6 @@
     -fx-background-repeat: no-repeat;
 }
 
-.chat-box {
-    -fx-background-color: #0d9e3b;
-    -fx-background-radius: 58;
-    -fx-border-radius: 50;
-    -fx-border-color: #5c3d10 #3d260a #3d260a #5c3d10;
-    -fx-border-width: 12;
-    -fx-padding: 20;
-    -fx-effect: dropshadow(one-pass-box, rgba(0,0,0,1), 0, 0, 15, 15);
-}
-
-.chat-header {
-    -fx-text-fill: #ffffff;
-    -fx-font-size: 22px;
-    -fx-font-weight: bold;
-    -fx-padding: 0 0 10 0;
-    -fx-effect: dropshadow(one-pass-box, #000000, 0, 0, 3, 3);
-}
-
 .info-text {
     -fx-text-fill: #ffffff;
     -fx-font-size: 16px;
@@ -65,12 +47,6 @@
     -fx-effect: dropshadow(one-pass-box, #000000, 0, 0, 3, 3);
 }
 
-.chat-separator {
-    -fx-background-color: #ffffff;
-    -fx-min-height: 4px;
-    -fx-effect: dropshadow(one-pass-box, #000000, 0, 0, 3, 3);
-}
-
 .taskbar {
     -fx-background-color: rgba(13, 158, 59);
     -fx-background-radius: 23;
@@ -273,56 +249,3 @@
     -fx-font-weight: bold;
     -fx-font-size: 16px;
 }
-
-.chat-scroll-pane {
-    -fx-background-color: transparent;
-    -fx-background: transparent;
-    -fx-border-color: transparent;
-}
-
-.chat-VBox {
-    -fx-background-color: transparent;
-    -fx-background: transparent;
-}
-.scroll-pane {
-    -fx-background-color: transparent;
-    -fx-border-color: transparent;
-}
-
-.scroll-pane .scroll-bar:vertical {
-    -fx-background-color: transparent;
-}
-
-.scroll-pane .scroll-bar .track {
-    -fx-background-color: #5c3d10;
-    -fx-background-insets: 0;
-    -fx-background-radius: 5;
-}
-
-.scroll-pane .scroll-bar .thumb {
-    -fx-background-color: #3d260a;
-    -fx-background-insets: 0;
-    -fx-background-radius: 5;
-    -fx-pref-width: 6;
-    -fx-pref-height: 6;
-    -fx-padding: 0;
-}
-
-.scroll-pane .scroll-bar:horizontal {
-    -fx-background-color: transparent;
-}
-
-.scroll-pane .scroll-bar:horizontal .track {
-    -fx-background-color: #5c3d10;
-    -fx-background-radius: 5;
-}
-
-.scroll-pane .scroll-bar:horizontal .thumb {
-    -fx-background-color: #3d260a;
-    -fx-background-radius: 5;
-    -fx-pref-height: 6;
-}
-
-.scroll-pane .scroll-bar:horizontal .thumb:hover {
-    -fx-pref-height: 10;
-}