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CSS center content within a div

Here's an old bit of code that I found to position something centrally inside an element.

#idOfTheDiv {
    width: 400px; /* here you put the width that you need */
    height: 200px; /* here you put the height that you need */
    position: absolute;
    left: 50%;
    top: 50%;
    margin-left: -200px; /* this number always to be the width divided two in negative */
    margin-top: -100px; /* this number always to be the height divided two in negative */
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Clive Walkden

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