The page contains frameset(s) that specify frame size using absolute, rather than relative, units.

Use percentage values rather than absolute values. Replace the values in the attributes ROWS and/or COLS of the frameset with percentage values.

Whenever possible it is best to use relative units.

Use percentage units rather than absolute units for frame height and width.

In this way the visual layout of the page will be "liquid", in the sense that it can adapt to the specific browser being used and the specific screen that supports it.

In the specific case of frames, using percentage values has the advantage that the browser user (the website visitor) can resize the entire window, or single frames at will without affecting the ability to experience the content of the page.