html - Keep Div Centered -

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how make div stay in middle of page. how change size of div?

html:

   <div id="text">    <p id="insidet">    hello    </p>    </div>

css:

 #text{   position: absolute;   width: 50%;   font-size: 60px;   text-align: center;   color: black;   height: 50%;   display: inline-block;   transform: translatey(-50%);   top: 50%;   margin: 0 auto;   color: black;   right: 320px;   background: white;

use absolute positioning, , transform centre div. dimensions not matter, until window size smaller div.

.centred {      height: 50px;      left: 50%;      position: absolute;      top: 50%;      transform: translate(-50%, -50%);      width: 200px;  }
<div class="centred">i in centre of page</div>





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