Update

Assets/UI/MainPanelSettings.asset

@@ -21,7 +21,7 @@ MonoBehaviour:
   m_ScaleMode: 1
   m_ReferenceSpritePixelsPerUnit: 100
   m_PixelsPerUnit: 100
-  m_Scale: 1.8199999
+  m_Scale: 1
   m_ReferenceDpi: 96
   m_FallbackDpi: 96
   m_ReferenceResolution: {x: 1200, y: 800}

Assets/UI/PauseMenu 1.uxml

@@ -0,0 +1,9 @@
+<ui:UXML xmlns:ui="UnityEngine.UIElements" xmlns:uie="UnityEditor.UIElements" xsi="http://www.w3.org/2001/XMLSchema-instance" engine="UnityEngine.UIElements" editor="UnityEditor.UIElements" noNamespaceSchemaLocation="../../UIElementsSchema/UIElements.xsd" editor-extension-mode="False">
+    <ui:VisualElement name="PauseMenuRoot" style="flex-grow: 1; align-items: center; justify-content: center; background-color: rgba(0, 0, 0, 0.7);">
+        <ui:VisualElement name="PauseContainer" style="width: 400px; padding: 40px; background-color: rgba(20, 20, 20, 0.95); border-radius: 10px; border-width: 2px; border-color: rgb(0, 255, 204);">
+            <ui:Label text="PAUSE" name="PauseTitle" style="font-size: 40px; color: rgb(0, 255, 204); -unity-font-style: bold; -unity-text-align: middle-center; margin-bottom: 30px;" />
+            <ui:Button text="RESUME" name="ResumeBtn" class="button-spring" style="margin-bottom: 15px; height: 50px; font-size: 20px; color: white; background-color: rgba(255, 255, 255, 0.1); border-radius: 5px;" />
+            <ui:Button text="LEAVE ROOM" name="QuitBtn" class="button-spring" style="height: 50px; font-size: 20px; color: rgb(255, 100, 100); background-color: rgba(255, 255, 255, 0.1); border-radius: 5px;" />
+        </ui:VisualElement>
+    </ui:VisualElement>
+</ui:UXML>

Assets/UI/PauseMenu 1.uxml.meta

@@ -0,0 +1,10 @@
+fileFormatVersion: 2
+guid: 01cf14ea38cdb3c4c8d8420124fbd479
+ScriptedImporter:
+  internalIDToNameTable: []
+  externalObjects: {}
+  serializedVersion: 2
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
+  script: {fileID: 13804, guid: 0000000000000000e000000000000000, type: 0}