Align inner div at center of outer div

While development you must have noticed that <div> tags are used more frequently in all programming languages. So, it is easier to align one <table><tr><td> at center of anothet <table><tr><td>.

But to align, one div at center of another div, we can use style's margin attribute like below.

<Div style="width:100%">
       <Div style="width:50%;margin:0 auto">
            Inner div at center of outer div
       </Div>
</Div>