removed extra border from graph

Frontend/power-tracker/src/pages/overview.tsx

@@ -119,7 +119,7 @@ function Overview() {
         <main>
 
           <div className = "rightbar">
-            <div className="h-[100%] w-[100%] relative overflow-auto rounded-md border shadow-md">
+            <div className="h-[100%] w-[100%] relative overflow-auto">
               <LineChart data={buildingData}/>
             </div>
           </div>