Different font sizes in description

Hi,
If I copy and paste text into the property description fields, the text can look different to when it is just typed straight into the fields. Is there any way to make pasted text the same size/colour/font as when it is typed in manually. The picture attached shows what I mean.

Hi Gordon,
If you paste the description from another source into the Editor of Joomla, it will have different style as the screenshot. You need to copy and paste the content to one text file before copt from text file and paste it back to editor to solve the problem.
Thanks
Dam