Add basic attachment progress bar styles
Add basic attachment progress bar styles

basecamp/trix,GabiGrin/trix,GabiGrin/trix,basecamp/trix,basecamp/trix,basecamp/trix,urossmolnik/trix,urossmolnik/trix,ChenMichael/trix,ChenMichael/trix,GabiGrin/trix,ChenMichael/trix,urossmolnik/trix