TextBox width as long as window

Hey guys,

when I add a Bootstrap TextBox, it is a width as my whole window. In Moshs tutorial it is much smaller.
Does anyone know why?

Thank and regards

I believe that is just a CSS problem. I was initially running into some CSS problems when starting with new bootstrap or whatever else. Being I don’t necessarily know which CSS you are using I can’t be really certain but that is my best bet.