Keeping a div half way across the screen no matter what resolution you are on [duplicate]

Question

What I want to know is how to have a <div> half way across the screen and height 100% no matter the screen resolution and window size resolution.

Thankyou all for your replies they all helped me! Sorry if this question was a little confusing, I have not really done any css before so I didnt know how to phrase it really...Thankyou once again!

Answer 1

In your reaction to @Arpit I understand you want to center the div no matter the screen resolution.

Try this:

#div {
    width: 800px;
    margin: 0 auto;
}

Different technique is:

#div {
    width: 800px;
    position: absolute;
    left: 50%;
    margin-left: -400px;
}

Answer 2

html,body { height:100%; }
#div_selector { width:50%; margin:0 auto; }