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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
<div class="slidingBorder"> BArdzo dlugi teks z animacja obramowania</div>
</body>
</html>
 
.slidingBorder {
    display: inline-block;
  position: relative;
    padding-bottom: 3px;
}
.slidingBorder:before {
    content: '';
    display: block;
    height: 3px;
  
    width: 0;
    background: transparent;
    transition: width .5s ease;
}
.slidingBorder:after {
    content: '';
    display: block;
    height: 3px;
    position: absolute;
    right: 0;
    bottom: 0;
    width: 0;
    background: transparent;
    transition: width .5s ease;
}
 
.slidingBorder:hover:after {
    width: 100%;
    background: black;
}
​
.slidingBorder:hover:before {
    width: 100%;
    background: black;
}
Output

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anonymouspro
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