Reimplement customization size by input
Reimplement customization size by button
Extract method to deactive all buttons
Set 100% when width or height is blank
Remove unneccessary context
Set input to specify size as instance variables
Delegate rendering proc in #changeIframeSize to #render
Remove unused variable
Add #changeIframeSizeByInput
Change method name: #changeIframeSize -> #changeIframeSizeByButton
Shorten names of so characteristic instance variables
Use instance variable to represent size values
Remove unneccesary variables
Use appropriate variable name
Manage active button as an instance variable
Remove #deactivateSizeButtons
Remove unused variables
Use template for dynamic tag generation
Update gems