Center div on the middle of screen [duplicate]

This should work with any div or screen size:

.center-screen {
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  min-height: 100vh;
}

 <html>
 <head>
 </head>
 <body>
 <div class="center-screen">
 I'm in the center
 </div>
 </body>
 </html>

See more details about flex here. This should work on most of the browsers, see compatibility matrix here.

Update: If you don't want the scroll bar, make min-height smaller, for example min-height: 95vh;

2018: CSS3

div{
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%);
}

This is even shorter. For more information see this: CSS: Centering Things

The best way to align a div in center both horizontally and vertically will be

HTML

<div></div>

CSS:

div {
    position: absolute;
    top:0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
    width: 100px;
    height: 100px;
    background-color: blue;
}

FIDDLE

Try this:

 div{
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -50px;
    margin-left: -50px;
    width: 100px;
    height: 100px;
    background: red;
}

Here div is html tag. You wrote a html tag followed by a dot that is wrong.Only a class is written followed by dot.

Center div on the middle of screen [duplicate]

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