Min width of facebook

I just want to know the minium width facebook has 开发者_如何学Go today. How I can know it? I want to copy it for my webpage... just that. Because I want to set my width in a tipical/best practice width now a days.

Thanks

This is their source:

.fbx #globalContainer {
    width: 981px;
}

#globalContainer {
    margin: 0 auto;
}