CSS3按钮效果

来自codepen,http://codepen.io/PalashSharma20/pen/YWBAgN

知识点：屏幕居中、transform、transition、transition-delay

最重要的是idea

<!DOCTYPE html>

<html>

<head>

    <meta charset="UTF-8">

    <title></title>

    <style>

        * { margin: 0; padding: 0; }

        body,

        html { height: 100%; min-height: 100%; }

        body { font-family: sans-serif; }

        .button { height: 200px; width: 400px; position: relative; top: 50%; left: 50%; transform: translateY(-50%) translateX(-50%); display: table; cursor: pointer; background: #252525; transition: 0.333333333333333s all ease-in; color: #ff4c4c; }

            .button .border { background: #ff4c4c; position: absolute; transition: 1s all linear; }

                .button .border.o { height: 5px; width: 0; bottom: 0; left: 0; transition-delay: 1s; }

                .button .border.tw { bottom: 0; right: 0; width: 5px; height: 0; }

                .button .border.th { top: 0; right: 0; width: 0; height: 5px; transition-delay: 1s; }

                .button .border.f { top: 0; left: 0; width: 5px; height: 0; }

            .button:hover { background: #ff4c4c; color: #252525; transition-delay: 2s; }

                .button:hover .o,

                .button:hover .th { width: 100%; }

                .button:hover .tw,

                .button:hover .f { height: 100%; }

            .button span { display: table-cell; vertical-align: middle; font-size: 40px; text-align: center; letter-spacing: 13px; text-transform: uppercase; font-weight: 100; }

    </style>

</head>

<body>

    <div class="button">

        <span>hover me</span>

        <div class="border o"></div>

        <div class="border tw"></div>

        <div class="border th"></div>

        <div class="border f"></div>

    </div>

</body>

</html>

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