How can i change content & sidebar width?

Hello! I would like to change my blog’s width. I realized that demo blog is wider than mine. I dont know why its different.

I’ve found some custom css codes to change the width’s but its not changing at all. And i couldnt find the correct codes in the Editor page. I hope you can help me! Thanks in advance :slight_smile:

My blog is

Hey there,
I hope you’re doing well today

On the post option be sure to select the full width page option for the post ( see screenshot)

You can also use the following CSS which will increase the width of all single posts with or without sidebar.
Use this option if all your posts don’t use sidebars.

/*increase single post content width*/
.single-post .col-md-8 {
    width: 80%;

Best Regards,