Add banner

src/components/NavigationFrame.js

@@ -70,6 +70,21 @@ export default function NavigationFrame({ children }) {
   return (
     <>
       <AppBar position="static">
+        <div
+          style={{
+            textAlign: 'center',
+            background: '#fafafa',
+            color: 'black',
+            paddingLeft: '24px',
+            paddingRight: '24px',
+            fontSize: '14px',
+          }}
+        >
+          <Typography>
+            Beware of sites attempting to impersonate sollet.io or other DeFi
+            services.
+          </Typography>
+        </div>
         <Toolbar>
           <Typography variant="h6" className={classes.title} component="h1">
             {isExtensionWidth ? 'Sollet' : 'Solana SPL Token Wallet'}
@@ -230,7 +245,9 @@ function NetworkSelector() {
                 <CheckIcon fontSize="small" />
               ) : null}
             </ListItemIcon>
-            {cluster.name === 'mainnet-beta-backup' ? 'Mainnet Beta Backup' : cluster.apiUrl}
+            {cluster.name === 'mainnet-beta-backup'
+              ? 'Mainnet Beta Backup'
+              : cluster.apiUrl}
           </MenuItem>
         ))}
       </Menu>