css3-雪花飘落效果

css3-雪花飘落效果

html:

    <section class="sn">
        <span class="snow snow-one"></span>
        <span class="snow snow-two"></span>
        <span class="snow snow-three"></span>
    </section>

css:

    <style>
        *{
            margin: 0;
            padding: 0;
            list-style: none;
        }
        html,body{
            width: 100%;
            height: 100%;
        }
        body{
            background-image: url('./img/sbg1.jpeg');
            background-size: 100% 100%;
            background-repeat: no-repeat;
            overflow: hidden;
        }
        .sn{
            width: 100%;
            height: 100%;
            position: absolute;
            left: 0;
            top: 0;
        }
        .sn .snow{
            width: 100%;
            height: 100%;
            background-image: url('./img/snow.png');
            background-position: 0 0;
            background-size: cover;
            position: absolute;
            left: 0;
            top: 0;
        }
        .sn .snow-one{
            filter: blur(4px);
            animation: animateOne 15s linear infinite;
        }
        .sn .snow-two{
            filter: blur(3px);
            animation: animateTwo 15s linear infinite;
            background-size: 800px;
        }
        .sn .snow-three{
            filter: blur(1px);
            animation: animateThree 15s linear infinite;
            background-size: 300px;
        }
        @keyframes animateOne {
            0%{
                background-position: 0 0;
            }
            100%{
                background-position: 150px 100vh;
            }
        }
        @keyframes animateTwo {
            0%{
                background-position: 0 0;
            }
            100%{
                background-position: 300px 800px;
            }
        }
        @keyframes animateThree {
            0%{
                background-position: 0 0;
            }
            100%{
                background-position: 0 100vh;
            }
        }
    </style>