I would like to tweak the default layout in SharePoint, e.g. add...
.ms-number {
white-space: nowrap;
}
... to all pages.
I know it is possible to modify a master page directly, but is it the best approach? What about themes?
If it's SharePoint on-premises then the best way is to create a Solution with a Feature with a For guidance see Adding jQuery to Every Page in SharePoint with Delegate Controls | |||
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There are some ways to achive this but I always use the style library to store my customized css files and reference them from the master page in the head section. Just add these lines if procceed.
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