Being Mailplane nothing more than a desktop interface that accesses Gmail.com ... you do not have internet connection available. All that is in Gmail, it’ll also in Mailplane. - Icon designed by Jonas ...

Step 2: Next, select the Settings gear icon the upper-right corner ... simply navigate to the Signature section of your Gmail settings (as described in the desktop instructions discussed earlier ...

open Gmail.com on your desktop. Click the ‘Settings’ icon at the top right corner underneath your profile icon. Now, select ‘Themes’. Now, scroll down and look for the ‘Dark’ theme.