How to always center a flexible square in viewport with pure CSS? -


i know question: height equal dynamic width (css fluid layout)

but want more!! want flexible container has aspect ratio of square max-height , max-width of 100% of page (the window element) , on top of vertically , horizontally centered.

like this:

// container matches height of window // container-height = 100%; container-width = absolute-container-height -page/browser-window- -      #######      - -      #cont-#      - -      #ainer#      - -      #######      - ---------------------   // container matches width of window // container-width = 100%;  container-height = absolute-container-width --page--- -       - -       - -#######- -#######- -#######- -#######- -       - -       - ---------

is possible achieve pure css (and better cross-browser)?

edit: know there calc() css3, due poor mobile browser-support, don't want use it.

edit2: seems like, didn't make myself clear enough. need height , width of wrapper match height or width of window, depending on smaller.the square-container should never exceed smaller value of window-height/width.

this is, how done jquery:

 // container/#main-wrapper has top: 50%,  left: 50%, position: absolute  via css    $(window).resize(function () {     var $ww = $(window).width();     var $wh = $(window).height();      if ($ww > $wh) {         $('#main-wrapper').css({             height: $wh,             width: $wh,             margintop : ($wh / 2) * -1,             marginleft : ($wh / 2) * -1         });     } else {         $('#main-wrapper').css({             height: $ww,             width: $ww,             margintop : ($ww / 2) * -1,             marginleft : ($ww / 2) * -1          });     } });

i figured out. magic ingredients view-port units.

given html structure:

.l-table   .l-table-cell     .square

you can use css (well actuall scss, idea) make work

html, body{   height: 100% } l-table{   background: orange;   display: table;   height: 100%;    width: 100%; } .l-table-cell{   display: table-cell;   vertical-align: middle;   border: 2px solid black; } .square{   background: red;   margin: auto;   @media (orientation:landscape) {     width: 70vh;     height: 70vh;   }   @media screen , (orientation:portrait) {     width: 70vw;     height: 70vw;   } }

http://codepen.io/johannesjo/pen/rvfxj

for need it, there polyfill.


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