Care must be taken to achieve the right shape and scale for any rounded corner. It is possible for a corner to be too large or too small.
As a starting point, use these guidelines to create a corner radius that is appropriate in scale for an 8.5” x 11” layout. This combination creates a consistent branded look and feel for the radius. For layouts with larger dimensions (e.g., a large poster), the size of the radius will NOT grow in kind. That is to say, a layout that is 100% larger should NOT have a radius with an offset that is 100% larger or it will "feel" too large. When designing larger scale applications, use your discretion and the 8.5” x 11” guideline points to arrive at rounded corners that look similar across the brand.
See the three examples below to help identify the proper size and scale of rounded corners.
Note: When an element "floats" over other elements, the radius of the floating element should be the same size as the radius of the channel.