How to silence a noisy computer?

Hello. I have a cardboard box from a TV that someone bought (I picked it up from under the building with the intention of making a soundproof wall for my computer). When I go to sleep, I want to place it next to the computer to muffle the noise.
I lined it with a triangular soundproofing mat, but it doesn't work well. Inside it is about 10 cm wide, so I can stuff something in it. What can I stuff in there cheaply to muffle the sound? Maybe regular cotton or mineral wool? But I don't know if that's healthy either. Some people have some free cotton on OLX, but it's cut up and I'm not sure if the cut pieces will be suitable: https://www.olx.pl/d/oferta/welna-skalna-mineralna-0-37-mkw-105kg-na-m3-wysokie-parametry-izolacji-CID628-IDJjaj9.html

or
https://www.olx.pl/d/oferta/welna-mineralna-odpad-w-formie-rozdrobnionej-sprzedam-lub-oddam-CID628-IDXbQF3.html

Does anyone have any experience, hmm?

Hello. I have a cardboard box from a TV that someone bought (I picked it up from under the building with the intention of making a soundproof wall for my computer). When I go to sleep, I want to place it next to the computer to muffle the noise.
I lined it with a triangular soundproofing mat, but it doesn't work well. Inside it is about 10 cm wide, so I can stuff something in it. What can I stuff in there cheaply to muffle the sound? Maybe regular cotton or mineral wool? But I don't know if that's healthy either. Some people have some free cotton on OLX, but it's cut up and I'm not sure if the cut pieces will be suitable: https://www.olx.pl/d/oferta/welna-skalna-mineralna-0-37-mkw-105kg-na-m3-wysokie-parametry-izolacji-CID628-IDJjaj9.html

or
https://www.olx.pl/d/oferta/welna-mineralna-odpad-w-formie-rozdrobnionej-sprzedam-lub-oddam-CID628-IDXbQF3.html

Does anyone have any experience, hmm?

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