The conversation between human and AI assistant.
How do you add a scrollbar on Tumblr?
No, I don't. Can you explain how to add the scrollbar using custom CSS code?
Of course! You'll need to add the following code to your Tumblr theme's CSS section:

::-webkit-scrollbar { 
    width: 8px; 
}

::-webkit-scrollbar-track { 
    background-color: #F5F5F5; 
    border-radius: 10px; 
}

::-webkit-scrollbar-thumb { 
    border-radius: 10px; 
    background-color: #000000; 
}

This will add a black scrollbar with a gray background to your blog. You can adjust the colors and styling to your liking by editing the code. Simply paste the code into the CSS section of your Tumblr theme and save the changes.