用于可变消息长度的CSS Marquee

I am looking for marquee tag alternatives and found how to do this through css. However the messages I am using are of variable lengths, so is there an alternative to putting in the '45s' attribute to maybe 100% so that no matter how long or short the message is, the message will show all of the message and loop again once the message has been displayed? I am looking for marquee tag alternatives and f