The location of the sidebar in your Tumblr theme is controlled using Cascading Style Sheets, a Web language that modifies how HTML elements appear on a page. You can modify the CSS in your theme to relocate the sidebar from one side of your blog to the other, or force the sidebar to move along with the scrollbar.

Reposition the Sidebar

Step 1

Log in to your account and then select the gear icon from the main menu on the Dashboard.

Step 2

Choose a blog from the left-hand side and then click the "Customize" button next to the Theme field to go to the customization page.

Step 3

Click "Edit HTML" and then press "Ctrl-F" to open Find. Type "sidebar" into the search field and then press "Enter" until you locate code that resembles the following:

sidebar {

float: x;

"X" represents the value used to define the "float" property. Replace "x" with "left" or "right," depending on where you want the sidebar to appear.

Step 4

Click "Update Preview" and then click "Save" to apply your changes.

Step 5

Click the back arrow and then click "Exit" to leave the customization page.

Make the Sidebar Move as You Scroll Up or Down

Step 1

Log in to your account and then select the gear icon from the main menu on the Dashboard.

Step 2

Choose a blog from the left-hand side and then click the "Customize" button next to "Theme" to browse to the customization page.

Step 3

Click "Edit HTML" and then press "Ctrl-F" to open Find. Type "sidebar" into the search field and then press "Enter" until you locate the following code:

sidebar {

Step 4

Type "position: fixed;" on a new line, so that your code resembles the following:

sidebar {

position: fixed;

Step 5

Click "Update Preview" and then click "Save" to apply your changes.

Step 6

Click the back arrow and then click "Exit" to leave the customization page.