Add a border to an object in Pages on Mac
You can add a border, such as a picture frame or a dotted line, around an image, shape, text box, or video, then modify the border’s thickness, color, and other attributes.
Note: To add or change a border for a chart, see Add a border and background to a chart.
Click to select an image, shape, text box, or video, or select multiple objects.
In the Format sidebar, click the Style tab.
Click the disclosure triangle next to Border, then click the pop-up menu and choose a type of border (line or picture frame).
Use the controls that appear to adjust the look of the border.