diff --git a/README.md b/README.md
index ef3bcbf..cd4413d 100644
--- a/README.md
+++ b/README.md
@@ -95,9 +95,14 @@ only injection point, and it needs a little CSS to look like a real button.
 Dashboard → General → Branding → **Login disclaimer**:
 
 ```html
-<a href="/OidcAuth/login" class="raised block emby-button">Sign in with SSO</a>
+<a href="/OidcAuth/login" class="raised cancel block emby-button"><span>Sign in with SSO</span></a>
 ```
 
+`cancel` gives the grey look of the Quick Connect button; swap it for
+`button-submit` to match the blue Sign In button. Do not copy `btnQuick` off the
+Quick Connect button — that class is what the login page binds Quick Connect to,
+not styling.
+
 Dashboard → General → Branding → **Custom CSS**:
 
 ```css
@@ -119,6 +124,10 @@ from the classes instead. `.disclaimerContainer` is not a block by default,
 which is what otherwise leaves the link shrink-wrapped and centred instead of
 matching the width of the buttons above it.
 
+It has to be an anchor. Copying the markup of a real login button does not work:
+`<button>` cannot navigate without an `href`, and DOMPurify removes `onclick`
+along with `is`, so the result renders correctly and does nothing when clicked.
+
 Styling via the theme's own classes rather than inline styles keeps the button
 correct when the theme changes, since `.raised` is defined per theme.