fix: Spotify embed shows white background in dark mode

shared/editor/embeds/Spotify.tsx

@@ -1,4 +1,5 @@
 import * as React from "react";
+import styled from "styled-components";
 import Frame from "../components/Frame";
 import { EmbedProps as Props } from ".";
 
@@ -23,7 +24,7 @@ function Spotify(props: Props) {
   }
 
   return (
-    <Frame
+    <SpotifyFrame
       {...props}
       width="100%"
       height={`${height}px`}
@@ -34,6 +35,10 @@ function Spotify(props: Props) {
   );
 }
 
+const SpotifyFrame = styled(Frame)`
+  border-radius: 13px;
+`;
+
 Spotify.ENABLED = [new RegExp("https?://open\\.spotify\\.com/(.*)$")];
 
 export default Spotify;