1按住滑块，拖到最右边文字背景.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no, width=device-width"/>
    <title></title>
    <style>
        .nc-lang-cnt {
            width:300px;
            background: -webkit-gradient(linear, left top, right top, color-stop(0, #4d4d4d), color-stop(.4, #4d4d4d), color-stop(.5, #fff), color-stop(.6, #4d4d4d), color-stop(1, #4d4d4d));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            -webkit-animation: slidetounlock 3s infinite;
            -webkit-text-size-adjust: none;
        }
        @-webkit-keyframes slidetounlock {
            0% {
                background-position: -200px 0
            }
            100% {
                background-position: 200px 0
            }
        }
    </style>
</head>
<body>
<div class="nc-lang-cnt">请按住滑块，拖动到最右边</div>
</body>
</html>