html - CSS Image pos middle in dynamic proportionally height/width div -


need solve little task:

  1. center vertically , horizontally image in div.
  2. div height must proportional width.
  3. div width stretchable (for example 50% of parent div).
  4. image width , height = auto (it must fill div if width or height > div width or height, , have primary size if < div size, , stay proportional).

i know how make 2 , 3.

html:

<div class="container">      <img src="img.png"/> </div>

css:

.container {     width: 100%;     height: 0;     padding-bottom: 100%; }

but how center , middle image in div? there lot of ways make 1 task non proportional , non strechable div. dont know how make in full house of tasks.

can help? html , css may any.

did try : 

    .container img {         vertical-align : middle     }

? verticaly align image.


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