CodePen Embed - background & display Animation DEMO

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    <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Omnis dicta incidunt ut illo, ratione aut reprehenderit facilis mollitia saepe ducimus libero hic reiciendis deserunt optio veniam ullam. Beatae, non quae.
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</div>

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html,
body {
    width: 100%;
    height: 100%;
    display: flex;
}
​
div {
    width: 500px;
    margin: auto;
    
}
​
p, a {
    width: 500px;
    font-size: 24px;
    line-height: 1.25;
    color: #000;
    cursor: pointer;
    text-align: justify;
    background: linear-gradient(90deg, blue, green);
    background-size: 100% 100%;
    background-repeat: no-repeat;
    transition: all .6s linear;
}
​
p:hover ,
a:hover {
    background-size: 0 100%;
}
​

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