html - Adaptive width layout just with css3? -

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i having lot of trouble figuring 1 out, have 3 columns: navbar (dark gray), main content (dark red) , sidebar (dark green) navbar can expanded , shrinked , sidebar can slide out , slide in (so change width 0 , 0). , want keep of responsive. idea shrink main content accordingly when or both navbar , sidebar expanded. unfortunately way can think change width of main content width: calc(100% - navbar width - sidebar width) verbose when need check if sidbar expanded or navbar, or both not expanded etc...

here image illustrating how main content shrinks:

enter image description here

i assume flexbox used here somehow, not able figure out.

let example marku be

<nav> </nav> <main> </main> <aside> </aside>

note: nav , aside need 100% height of page , fixed in place.

you can use flex-box this. simple approach follows: http://codepen.io/anon/pen/pgvvjb

you can change classes see how changes layout. note: using classes change width of columns use javascript or static css similarly.

code dump:

<div class="container">   <div class="small">nav</div>   <div>content</div>   <div class="medium">sidebar</div> </div>  html, body, div {   height: 100%;     margin: 0;   padding: 0; }  .container {   display: flex; }  .container div {   flex: 1;   border: 1px solid #ccc;   background: gray; }  .small {   max-width: 50px; }  .medium {   max-width: 150px; }

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