Centering in CSS, When The Object Is Larger Than The Viewport

Centering in CSS, when the object is larger than the viewport

Here's the best solution I've been able to find uses a wrapping element around your-fixed-width content, then a -50% margin on the content itself. This is off the top of my head, but it should be enough to get you started. Here's the code snippet:

div.wrapper {
    position: absolute;
    left: 50%;
}
.content {
    position: relative;
    margin-left: -50%;
}

<div class="wrapper">
    <div class="content">JQUERY BIZ-NASS HERE</div>
</div>

Of course, this assumes that your div here is a direct descendant of the body tag, and that your browser specifies body to have a width of 100% and no margin or padding.

Make a div center of viewport - Horizontally and vertically

#wrapper
{
 width:500px;
 height:500px;
 margin:0 auto;
 background:#f7f7f7;
 position:absolute;
 left:50%;
 top:50%;
 margin-left:-250px;
 margin-top:-250px;
}

Demo: http://jsfiddle.net/fJtNQ/

Why is this working?

Well, basically you have an absolute positioned element inside the dom. It means that you can position it wherever you want and if you don't have a relative positioned element as parent, left and top will be the distance from the document's left/top origin.

Assigning left:50% and top:50% enables this element to be positioned always in the center of the screen, but in the center you will find the top left corner of the element.

If you have fixed width/height, you can easily 'translate' the point in the center to be actually the center of the wrapper div by giving negative margin-left and margin-top (therefore with the help of some extremely easy basic math their values will be -(width/2) and -(height/2))

EDIT

You can also easily center by using flexbox, plus (a big one) you don't need to specify w/h, i.e.:

body { /* can also be whatever container */
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
  -webkit-justify-content: center;
  justify-content: center;
}

#wrapper {
  /* whatever style u want */
}

demo: https://jsfiddle.net/00utf52o/

Center a position:fixed element

If your div has a known width and height, then you basically need to set top and left to 50% to center the left-top corner of the div. You also need to set the margin-top and margin-left to the negative half of the div's height and width to shift the center towards the middle of the div.

position: fixed;
width: 500px;
height: 200px;
top: 50%;
left: 50%;
margin-top: -100px; /* Negative half of height. */
margin-left: -250px; /* Negative half of width. */

Or, if your div has a dynamic/undefined width and/or height, then instead of the margin, set the transform to the negative half of the div's relative width and height.

position: fixed;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);

Or, if your div has at least a fixed width and you don't care about centering vertically and old browsers such as IE6/7, then you can instead also add left: 0 and right: 0 to the element having a margin-left and margin-right of auto, so that the fixed positioned element having a fixed width knows where its left and right offsets start. In your case thus:

position: fixed;
width: 500px;
margin: 5% auto; /* Will not center vertically and won't work in IE6/7. */
left: 0;
right: 0;

Again, this works only in IE8+ if you care about IE, and this centers only horizontally not vertically.

Viewport Centered div Alignment

To achieve expected result, use below

HTML:

 <div class="card">
      <div class="content">
        Main Content
      </div>
      <div class="reference">
        Reference Content
      </div>
    </div>

CSS:

body {
  background: rgb(0, 14, 32);
  color: white;
  font-size: 2em;
   display: table;
   width:100%;
  text-align:center;

}

.card {
  height: calc(100vh);
 display: table-cell;
 vertical-align: middle;
  margin: auto;

}

.content {
  text-align: left;   
  border: solid white;

}

.reference {
  text-align: right;
  font-size: 0.5em;
  border: solid blue;

}

Codepen- https://codepen.io/nagasai/pen/qmVKjB

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