CSS: how to align text content horizontally-centered and vertically-centered?

Question

how can i align text content inside div horizonally-centered and vertically-centered?

   <div style="height: 300px;">
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Answer 1

You need to use display: table-cell; and vertical-align: middle; properties with text-align: center; as well to align the text vertically and horizontally centered

Demo

div {
    border: 1px solid #f00;
    display: table-cell;
    text-align: center;
    vertical-align: middle
}