margin of customMediaItem in jsqmessageviewcontroller

i have a class that extend: JSQLoadingPhotoMediaItem, all works fine expected that in my chat i do not use image for bubble, but i have a background color and radius for textView inside the bubble, if i use the class i obtain this:

The first one is the textView of the cell with a color background, the second one is a view that i retu from class with this code:

view = UIView(frame: CGRect(x: 0, y: 0, width: UIScreen.mainScreen().bounds.width, height: 38))
    view!.backgroundColor = UIColor(red:0.89, green:0.98, blue:0.78, alpha:1)
    view!.layer.coerRadius = CGFloat(9)
    view!.layer.masksToBounds = true

in a function

override func mediaView() -> UIView!

How can i give the same right margin to my custom class? or if for example would like to have a view of custom class aligned center?

Thanks!