Hackers Help: How to raise SVÄRTA loft bed?

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Photo: IKEA.com

I’m looking at getting a SVARTA loft bed, the smaller kids version. But I need to increase its height by a few cm. i.e, I’d like to add some form of blocks under the bed’s 4 legs, so that both the desk and the mattress area above are raised some so that an adult can sit a bit more comfortably at the desk below.

(Yes I know there is a larger, higher SVARTA for adults, but that is again too high for my needs.)

Anyone got a good safe idea on how to accomplish that in an easy/safe way? Jut putting the legs on blocks looks unsafe to me..

Alternatively, would it be safe to saw off some of the legs of the larger bed?