Sidebars are helpful layout elements to add extra content, links and information to your Tumblr site. Whether you are creating a Tumblr theme or modifying an existing one, you can add a sidebar to the theme layout. By using the Cascading Styling Sheets method and the appropriate Hypertext Markup Language tags, you can easily insert a sidebar into the theme.
Launch a text or HTML editor on your computer and open the Tumblr theme you are working on.
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