feat: add shadow to social buttons

src/components/WelcomeModal.tsx

@@ -102,7 +102,7 @@ const WelcomeModal: Component = (props) => {
     props
   ) => (
     <a
-      class={props.provider}
+      class={props.provider + " shadow"}
       data-via={props.via}
       aria-label={`Share on ${capitalize(props.provider)}`}
     ></a>