If you have an in-ground swimming pool that you need to close with a set of center steps at the end of the pool there is something you should know if you are planning to close the pool with a standard solid pool winter cover. If you have the center step at the end of your pool you will need to make sure that you buy a cover that has the step built into the material. Most pool covers can be ordered with a left, right or center step.
If you cannot find a cover that is custom made to fit your step position ( left, right, or center step) then your other choice would be to buy an over sized pool cover that will fit over the pool and then the step as well. So for example if you had a 20 x 40 pool with a 5 foot deep center step, you could buy a cover that is 28 x 40 or bigger so the step will be covered.