Web view blocks can be used to display any live hosted webpage in your page.
To add one just drag the "Web view block" into your page layout.
You can resize the frame to whatever size you want by dragging the corners of the Web view frame. Then just enter the URL to the webpage you want displayed in the field in the right-hand column URL field.
NOTE: The Web View frame will load a basic preview of the webpage once a URL has been entered but will not be interactive. You'll need to check the design by pushing it to your Semble Reviewer App on your iOS or Android device.