alignment of pictures so that they always appear in one line

I want to align 5 pictures in the HTML-Text widget so that they are always in one line, as well in desktop mode as in mobile mode. I tried to use the width=20% statement for all pictures. The problem is, it works only if i use width=19% for all pictures. If i use width=20%, then the last picture appears in the 2. line. But then i don't have pixel perfect alignment cause of the missing 5%. Why is it so?