How to remove white line from promotion grid

[lagentilestore]

Please see attached picture

on the left side (green) is some white space showing. How can I remove this? Image should have full page width just like the other images from the promotion grid. 

[Made4uo-Ribe]

Hi @lagentilestore 

Are you referring to this one?

If it is, try this.

1. From your Shopify admin dashboard, click on "Online Store" and then "Themes".
2. Find the theme that you want to edit and click on "Actions" and then "Edit code".
3. In the "Assets" folder, click on "base.css, style.css or theme.css" file, depending on which file your theme uses to store its CSS styles. At the bottom of the file, add the following CSS code:

.flex-grid__item.flex-grid__item--100.flex-grid__item--advanced_JYGAkC.type-advanced {
    padding-left: 0;
}

• And Save. 
• result:
• 

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[lagentilestore]

Yes that is what I mean!

Your code is not working unfortunately..