上下跳动的箭头 css

在H5场景动画时，常常会用到着一样一个效果，箭头持续上下跳动来引导用户上下滑动整个页面

<!DOCTYPE html >
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>css动画--元素上下跳动</title>
        <style type="text/css">
        @-webkit-keyframes bounce-down {
         25% {-webkit-transform: translateY(-10px);}
         50%, 100% {-webkit-transform: translateY(0);}
         75% {-webkit-transform: translateY(10px);}
        }

        @keyframes bounce-down {
         25% {transform: translateY(-10px);}
         50%, 100% {transform: translateY(0);}
         75% {transform: translateY(10px);}
        }

        .animate-bounce-down{ background:#333; width: 100px; height: 100px; margin:100px auto;-webkit-animation: bounce-down 1.5s linear infinite;animation: bounce-down 1.5s linear infinite;
        }

        @-webkit-keyframes bounce-up {
         25% {-webkit-transform: translateY(10px);}
         50%, 100% {-webkit-transform: translateY(0);}
         75% {-webkit-transform: translateY(-10px);}
        }

        @keyframes bounce-up {
         25% {transform: translateY(10px);}
         50%, 100% {transform: translateY(0);}
         75% {transform: translateY(-10px);}
        }

        .animate-bounce-up{ background:#ddd; width: 100px; height: 100px; margin:100px auto;-webkit-animation: bounce-up 1.4s linear infinite;animation: bounce-up 1.4s linear infinite;}
        </style>
    </head>
    <body>
        <div class="animate-bounce-up"></div>
        <div class="animate-bounce-down"></div>
    </body>
</html>

上下跳动的箭头 css

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