What are dimensions for a custom twitter background?

• There is no set background size. Background dimensions vary due to the different browser sizes of users.
  
• If you want to make a background for your twitter account page, you have to take a few things into consideration to make sure it is the right size and how to look it all Internet users.

• Basically, you must make a background of 1920x1080px for your background to fill the page for all users but if you design it to that size, users at lower resolutions won't see most of the background at all.

• The most common screen resolution used by people on the Internet is 1024x768
  its meaning 1024 pixels wide and 768 pixels high. So you need get idea about what is  your twitter background dimension and how it look for another  users