With WP 5.0 you can now enable full width blocks in the editor by adding this to your theme: add_theme_support( 'align-wide' );

However, if you are using a custom theme you have to add your own CSS to make that work. There are lots of examples out there that do work -- but on Mac only.

The problem is if you use width: 100vw, which is the best way I've found to do this, on Windows devices you get a horizontal scroll bar as soon as you have a vertical scroll bar on the page. I understand this is actually per the viewport width spec, so I'm really hoping to find another way to actually make this work on all devices.

What I have now avoids the scrollbar, but it means using overflow: hidden which is less than ideal and you do get the edges cut off.

.entry-content .alignfull {
    position: relative;
    width: 100vw;
    left: 50%;
    right: 50%;
    margin-left: -50vw;
    margin-right: -50vw;
body .entry-content .alignfull > * {
    width: 100vw;
    max-width: none;

I then add an overflow: hidden; on my outside container <div> of whatever wraps the_content() so as to hide the scrollbar.


After banging my head over that horizontal scroll bar issue, I think going the other way and adding a max width to blocks without the alignfull classes. If you just remove your page templates wrapper and assume it as 100%. Here is a pen with the WP markup as closely emulated as I could https://codepen.io/nickfmc/pen/vvbWQa

.editor-content > *:not(.alignfull) {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;

.editor-content > *:not(.alignfull).alignwide {
  max-width: 1400px;
  • Hmm. This looks like a really interesting idea. Only problem is I think you have to have a wildcard (*) selector instead of the wp-block. The issue if you don't, what if you just have paragraph text block or a heading block? They aren't wrapped by wp-block-XXX class so they run full width when they shouldn't. – Trevor Feb 11 at 1:10
  • updated as per your suggestion, I think you are right this is a better way to go. Seems to be working well for me using this solution – NickFMC Feb 22 at 21:40

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