Steps:
- Log in to your Blogger account
- click on Your blog>>Template>>Backup (backup is necessary if something went wrong so that you can easily recover it)
- Now Go to Edit HTML
- Click in the box and press Ctrl+F
- Now find the following piece of code
#outer-Wrapper
There you will see different codes like below
#outer-Wrapper
#content-wrapper
#main-wrapper
#rsidebar-wrapper
#lsidebar-wrapper
Now you have to edit These but patiently and according to your needs
Outer wrapper: it is the whole body of your template so you can change it wisely just a few px up or a few px down in respect to the sidebars and main content.
content-wrapper: it contains only colors fonts etc if you wanna change the color of your blog contents so change it with your desire hex color (#ffffff)
main-wrapper: This is the post area of your blog it will change width of your post/articles. So you can change its px to anything you like with respect to outer-wrapper.
rsidebar and lsidebar-wrapper are the sidebars so change its px according to your and the the outer wrapper.
Any Questions drop your comments and hope you don't forget to hit a share to spread love.
#content-wrapper
#main-wrapper
#rsidebar-wrapper
#lsidebar-wrapper
Now you have to edit These but patiently and according to your needs