html - How to center a div and make it "sticky" then disappear -

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i have been searching , trying sorts of things working. have site making want logo centered @ top of screen. z-index highest thing on page , stay in place while user scrolls down. then, logo passes div beneath it, have logo fade out.

so basically, want centered (responsive, possible?) div sits on top in z-space , stays put while scroll down. fades out begins running content down page.

codepen: https://codepen.io/anon/pen/gxkjno

if add position:fixed either #logo element or logo wrapper div (#logo_div) breaks in different ways.

#logo-div {      z-index: 1;      width: 30vw;      height: 30vh;      margin: 0 auto;      display: block;  }  #logo {      max-height: 100%;      max-width: 100%;      margin: 0 auto;  }  #testy {      display: block;      overflow: hidden;      position: relative;  }  #separator {      background-color: white;      z-index: -999;  }  #map-canvas {      background-color: grey;      z-index: : -998;  }
<div id="logo-div">      <img id="logo" src="https://image.freepik.com/free-icon/apple-logo_318-40184.jpg">  </div>  <div id="separator">      <p>lorem ipsum dolor sit amet</p>  </div><!--seperator-->  <div id="map-canvas"></div><!--map-canvas-->





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