I created a 2 column layout block, gave the columns block a CSS class of .first-col-2-3

and added this CSS to my theme:

.first-col-2-3 > div:nth-child(1) {background:red;width:67%!important;}

.first-col-2-3:nth-child(2) {width:33%!important;}

The result is that the columns stay 50% / 50% width.

But the first one does get a red background.

So the correct column is targeted, yet the width property isn't changing to make the two columms 67% and 33% respectively.

How do I make the column widths change?

I see a way to add a CSS class to the paragraph within each column but that doesn't work either. Any ideas / solutions? Thank you!

1 Answer 1


You can add a 2 column block layout where 1 block takes up 2 thirds in the block editor using the UI. Adding CSS classes to achieve this is highly unusual and unnecessary

When you add a column block it asks you:

enter image description here

Resulting in column blocks spaced for thirds:

enter image description here

Each block has a percentage width in the block settings:

enter image description here

If you wanted to use the CSS classes from your theme you have several options:

  • Build a custom columns block
  • Add CSS classes to the column blocks, completely override or remove the block CSS and add in your own

It appears you tried to do the latter, and ran into a 100% pure CSS issue, CSS questions are best asked on stackoverflow (they're offtopic on WPSE as they aren't WordPress questions)

  • I'm not seeing that UI come up in WordPress 5.2.5. When I click on the block settings I'm not getting column settings, just settings for the objects contained in columns (images, headings, etc.)
    – javaandy
    Jan 6, 2020 at 14:08
  • Upon upgrade to 5.3.2 it worked! Thank you.
    – javaandy
    Jan 6, 2020 at 14:11
  • You have to have the column block selected, it sounds like you had one of its child/nested blocks selected instead
    – Tom J Nowell
    Jan 6, 2020 at 16:23

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