Check out this new + useful infographic from Litmus that shows every issue about CTAs you could possibly want to know about. A lot of the ideas are obvious, but the obvious isn’t always obvious, particularly when there are other design constraints. Of course, colour and size get a mention, but did you know there is even a law to back this up; this Fitt’s Law states that:

“The time required to rapidly move to a target area is a function of the distance to the target and the size of the target”.

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