Add class

wiki/src/install/inc/steps/restart_first_time.inline.mdwn

@@ -92,7 +92,7 @@ in a similar way.</p>
    """]]
 
 1. In *Tails Greeter*, select your preferred language in the drop-down
-list on the bottom left of the screen. Click **Login**.
+list on the bottom left of the screen. Click <span class="button">Login</span>.
 
 1. After 15&ndash;30 seconds, the Tails desktop appears.