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I usually try to avoid plug-ins that haven’t been updated for ages and/or are unproven with the current version of WordPress, but this plug-in does a simle job very well. This is a very common requirement and yet there are very few plug-ins that offer this service. shard’s article https://wordpress.org/support/topic/excellent-but-newbies-will-struggle-to-figure-it-out?replies=3 was a Godsend as the documentation is very sparse and you do need to get your hands dirty with the html. Even so, this is much much easier than manually writing html and css to do the job.