Hi i am pretty new in rendering and really confused in creating a simple white backgroud for rendering a white plastic chair...

https://media.designconnected.com/vfs...876d782080d083...

it should look like this... pretty simple... my problem ist that my raytrace shadows do not want to work like this and also i want to avoid a border edge in the back that is caused by my lighting everytime...

i think it is not much work actually but i am too stupid for this i think...my chair model is ready so i only need the background... could someone make me a backgoround like on the pic? that would be so great and i would save much time...

thanks in advance!