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/*******************
 * 在雪花上奔跑 (逆時針範例,雪花放大至200%,奔跑5秒)
 * 滑過雪花之後就會自動跑一圈
 *******************/
.snowflake, .snowflake:hover {
    color: #FFFC;
    opacity: 1;
    right: 140px;                    /* 雪花位置 */
    bottom: 145px;                   /* 雪花位置 */
    transform: scale(200%);          /* 可以放大雪花及奔跑圖,放大200% */
    width: 50px;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.snowflake::before {
    position: absolute;
    content: ' ';
    background-image: url('https://emos.plurk.com/f633accedaf53360f817a930c72d6dd8_w22_h23.gif');   /* 奔跑圖片網址 */
    background-repeat: no-repeat;
    background-position: center top;
    width: calc(100%*1.7);                /* 按照圖片大小調整(預設1.7倍) */
    height: calc(100%*1.7);               /* 按照圖片大小調整(預設1.7倍) */
    transform: rotate(-360deg);           /* 360deg=順時針跑,-360deg=逆時針跑一圈 */
    transition: transform ease-in-out 5s;           /* 奔跑時間(預設5秒) */
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
    
}
.snowflake:hover::before {
    transform: rotate(0deg);
    transition: ease-in-out 0s;
}