Hi @Alexandre Aguilar,

.osui-tabs__content-item: This selector targets elements with the class osui-tabs__content-item. These are likely the individual content panels displayed within the tab widget.

.columns: This is a descendant selector. It selects any element with the class columns that is nested within the previously targeted .osui-tabs__content-item element. This means it specifically targets columns that are placed inside the content panels of the tab widget.

max-width: 99.9%: This style rule sets the maximum width of the targeted columns to 99.9%. This restricts the width of the columns to a value slightly less than 100%.

Why it might be breaking your layout:

The max-width: 99.9% rule is likely causing issues because it might be interfering with the intended width you've set for your columns. By setting a maximum width slightly less than 100%, it might be causing horizontal overflow or unexpected margins in your layout.
you can Override the CSS.

like : 

.osui-tabs__content-item .columns {  

max-width: 100% !important; 

} 

Regards,
Sanjay Kushwah