you can fix the wrapper using absolute positioning. and the give inside div a fixed position.
.wrapper{
position:absolute;
left:10%;// or some valve in px
top:10%; // or some valve in px
}
and div inside that
.wrapper .fixed-element{
position:fixed;
width:100%;
height:100%;
margin-left:auto; // to center this div inside at center give auto margin
margin-right:auto;
}
try this It might work for you