How do I get spotlight/shadow position to remain exactly same relative horizontal center position regardless of zoom?

Tags: html,css

Problem :

In the following fiddle I successfully have made the spotlight stay in the same place (horizontally centered) except for when my zoom factor is too large. In other words, when I zoom in my spot light does not stay in the center of the horizontal view port.

Please note the use of .spotlight-2:before to fill the left portion of the shadow on the viewport. This is what I needed to prevent non shaded region from appearing.

How do I make the spotlight stay in center horizontally and not shift to the right when zooming in closely in the browser?


Resulting Output


td .div{
  height: 400px;

.extend-full {
  padding-left: 3000px;
  margin-left: -3000px;
  padding-right: 3000px;
  margin-right: -3000px; }

        top: 0px;
        float: left;
        display: block;
        background: radial-gradient(10px 10px at 560px 400px, transparent 0, transparent 150px, rgba(0, 0, 0, 0.5) 160px);
        background: -moz-radial-gradient(10px 10px at 560px 400px, transparent 0, transparent 150px, rgba(0, 0, 0, 0.5) 160px);
        background: -webkit-radial-gradient(10px 10px at 560px 400px, transparent 0, transparent 150px, rgba(0, 0, 0, 0.5) 160px);
        background: -o-radial-gradient(10px 10px at 560px 400px, transparent 0, transparent 150px, rgba(0, 0, 0, 0.5) 160px);
        margin-left: 0px;
        height: 100%;
        position: fixed;
        width: 100%;
        min-width: 100vw;
        min-height: 100vh;
        z-index: 10;
      position: absolute;
      width: 100%;
      z-index: 10; }

    .account-settings-confirm-container-overlay {
      z-index: 10;
      background-color: white !important;
      height: 99px;
      position: absolute;
      margin-top: 10px;
      width: 250px;
      font-size: 12px;
      box-shadow: 0px 1px 1px 1px rgba(0, 0, 0, 0.1); }
    .spotlight-2:before {
      content: "";
      position: absolute;
      display: block;   
      left: -100%;
      height: 100%;
      width: 100%;
      background: rgba(0,0,0,0.5);  

Solution :

Try flexbox. See example fullpage

html, body {
  height: 100%;
  margin: 0;

  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  background-color: rgb(0,0,0);
  background-color: rgba(0,0,0,0.4);

  box-shadow: 0px 0px 5px grey inset;
    margin: auto;
    padding: 20px;
    background-color: #fefefe;
    border-radius: 50%;
<div id="viewport">
  <div class="box">
    <div class="a"></div>

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