html - show div in the center of current viewport on mobile devices -


how show div in center of current viewport? asking mobile devices, because problematic.

for example, have 2 buttons show same div. 1 @ top of page, , 1 @ bottom. page's height 2 viewport heights in total. if padding-top of presented div 40px, div not visible when bottom button being pressed. solution isn't flexible enough mobile devices. solution recommend?

diagram: if set padding-top 40px, green div appear @ top of page (as shown) if bottom red button pressed, green div appear @ top, 40px it. isn't visible user. should appear 40px top of second viewport (the screen users sees.) hope helps.

enter image description here

use position: fixed.

function togglediv() {      var div = document.getelementbyid('togglable');      if (div.style.display !== 'none') {          div.style.display = 'none';      }      else {          div.style.display = 'block';      }  };
#container-parent {    position: absolute;    background-color: #eee;    height: 95%;    width: 90%;    overflow: scroll;  }  #container {    height: 500px;  }  #togglable {    position: fixed;    top: 10%;    height: 80%;    left: 25%;    width: 50%;    background-color: red;  }  #spacer {    height: 90%;      }
<div id="container-parent">    <div id="container">      <input type=button onclick="togglediv()">      <div id="togglable"></div>            <div id="spacer">        <!-- don't know how have got buttons attached point `position: fixed` positions togglable div relative viewport -->      </div>      <input type=button onclick="togglediv()">    </div>  </div>


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