Light Switch Blind Cover

Since my son has now reached a size in which he can easily turn on and off light switches, but I do not know whether the WLAN modules in there that withstand a distance of 0.5 seconds, I wanted to buy a blind in the hardware store. However, the price has me more than scared.
So I just created a blind and this fits perfectly over the light switch and the son looks stupid :-)
But the purpose is fulfilled.