Javascript - How to alter a property of a css class -

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here's i'm trying do:

i want width of particular div changed every time resize window. div's class properties in external css document class name '.nav'.

in html:<body onresize="nav_resize()">

in js:

var w= window.innerwidth, h= window.innerheight;  var nav= document.getelementsbyclassname('nav');      function nav_resize(){  	if (w<700){ nav.style.width= w-150;}  }

	.nav{ background-color:#5f1c1c;  		  position:fixed;  		  float:left;   		  width:190px;  		  min-width:85px;  		  top:105px;  		  height:100vh;  		  overflow:hidden;  		  z-index:1; }
know i'm doing wrong since nothing happens when try in browser.
appreciated.

to control kind of resize events use @media css rule

@media screen , (min-width: 700px) {     // css style +700px }  @media screen , (max-width: 700px) {     // css style -700px }

this avoid problems resize both smaller bigger , opposite.


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