2 Added an idea and updated.
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BluTack(TM) maybe your answer, if you are on a vinyl or wooden floor. Other brands of Tacky putty are available. Try 'procure' some from the back of posters in schools / offices.

Just place some under your pedal and stick it to the floor. I wouldn't advise this on carpeted floors mind.

Elastic / Rubber bands could be used, either glue to the base of the pedal (if you have access to hot glue, or just wrap them around the pedal 'base structure' (not over the pedal itself mind) This will then add grip to the base of the pedal.

BluTack(TM) maybe your answer, if you are on a vinyl or wooden floor. Other brands of Tacky putty are available.

Just place some under your pedal and stick it to the floor. I wouldn't advise this on carpeted floors mind.

BluTack(TM) maybe your answer, if you are on a vinyl or wooden floor. Other brands of Tacky putty are available. Try 'procure' some from the back of posters in schools / offices.

Just place some under your pedal and stick it to the floor. I wouldn't advise this on carpeted floors mind.

Elastic / Rubber bands could be used, either glue to the base of the pedal (if you have access to hot glue, or just wrap them around the pedal 'base structure' (not over the pedal itself mind) This will then add grip to the base of the pedal.

1
source | link

BluTack(TM) maybe your answer, if you are on a vinyl or wooden floor. Other brands of Tacky putty are available.

Just place some under your pedal and stick it to the floor. I wouldn't advise this on carpeted floors mind.