Print versus Web
If you've never worked with the Web, you may be in for a bit of a rude awakening.
By its nature, websites are not going to look the same on every computer.You are not going to be able to control exactly how they look.
Colors especially are going to vary wildly.
Your choice of fonts is going to be limited.
Now that is not quite 100% true. The problem is, the cure is usually worse than the disease.