How to open div on center screen position ?

Question

How to open div on center screen position ?

Answer 1

div{

margin-left: auto;
margin-right: auto;
}

This only works if the div has a width of 95% or less

Answer 2

You can define a size for the DIV and position it absolutely (or Fixed), like this:

div{
     position:absolute; /* can also be 'fixed' */
     top:50%; left:50%; 
     width:200px; height:100px; 
     margin:-100px 0 0 -50px;
     z-index:99;
}

Or if you don't want to place it absolutly positioned, you can give it a width, and set it to:

div{ margin:0 auto; }