Add a border to a paginated report (Report Builder)
Applies to: 
Microsoft Report Builder (SSRS)
Power BI Report Builder
Report Designer in SQL Server Data Tools
You can add a border to a paginated report by adding borders to the headers, footers, and report body themselves, without adding lines or rectangles.
If you add a report border that appears on the page header and footer, don't suppress the header and footer on the first and last pages of the report. If you do, the border might appear cut off at the top or bottom of the first and last pages of the report. For more information, see Page headers and footers (Report Builder).
Add a border to a report
Right-click in the header outside any items in the header, and select Header Properties. On the Border tab, add a left, top, and right border with the style you want.
Note
If your report doesn't have headers, you can place borders around just the report body, or you can add headers from the Insert tab.
Right-click in the body outside any items on the design surface, and select Body Properties. On the Border tab, add a left and right border with the style you want.
Right-click in the footer outside any items in the footer, and select Footer Properties. On the Border tab, add a left, bottom, and right border with the style you want.