To clearly separate a chart from other elements on the page, you can add a chart border.

Chart Border

A decorative or functional line that encircles a chart, graph, or diagram to define its boundaries within a document or presentation.

Separate

to divide or distinguish items from one another to organize, categorize, or create distinction.

Chart

A visual representation of data designed to make it easier to understand, commonly seen in forms such as bar, line, or pie charts.