Centering items in react css

div.container4 {
    height: 10em;
    position: relative }
div.container4 p {
    margin: 0;
    background: yellow;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%) }

Source: w3.org

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