html - itHow do I make div/ div images not move when resizing, while also allowing them to have a % from the top -

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i want able resize window while divs keep position on page , resize % of width , height declare.

html:

<body>   <div class="view">       <div class="tree">                     <img id="tree" src="img/tree.png">       </div>       <div class="ground">           <div class="g"></div>       </div>         </div> </body>

css:

.tree {   position: absolute; }   .tree #tree {     position: relative;     height: 75%;     width: 75%;     left: 30%; }  .ground {   z-index: 2;   width: 100%;   height: 100%; }   .ground .g {     background-color: green;     opacity: .5;     position: relative;     height: 50%;     width: 100%; }

the tree stays pretty constant, when window largest can on macbook, slides on left little. ground element vertically takes half page, instead want placed 50% top. when try apply 'top' style either of them nothing happens. know because #tree relative .tree , don't declare height/ width. don't declare h/w because makes #tree image's w/h off.

thank help!

edit, added clarification:

i want divs resize according window width. don't want them change left position. , want able set 'top' % because can't.

fiddle: https://jsfiddle.net/sqdgzbp6/

notice on website: anniwang.com if resize entire window drawings seem resize don't loose position on page. want recreate effect similar hers.

as .tree absolute positioned element, need height/width set explicit or else no child percent have calculate percent from, in sample gave height , top work.

.tree {    position: absolute;    height: 100%;    width: 100%;  }  #tree {    position: relative;    height: auto;    width: 60%;    left: 30%;    top: 20%;  }    .ground {    z-index: 2;    width: 100%;    height: 100%;  }  .ground .g {    background-color: green;    opacity: .5;    position: relative;    height: 50%;    width: 100%;  }
<div class="view">    <div class="tree">                <img id="tree" src="http://www.placehold.it/200/100">    </div>    <div class="ground">      <div class="g"></div>    </div>        </div>


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