body {
    font-family: Avenir, 'Helvetica Neue', 'Microsoft Yahei', 'Hiragino Sans GB', 'Microsoft Sans Serif', 'WenQuanYi Micro Hei', sans-serif;
}

.pokeball {
    transition:transform 1s;
    border-radius:100px;
    width: 200px;
    height: 200px;
    overflow: hidden;
    background: black;
    background-image: repeating-linear-gradient(-45deg,rgba(255,255,255,.9),rgba(255,255,255,1));
    box-shadow: 0 0 3px black;
    position: fixed;
  margin:auto;
  top:0;bottom:0;left:0;right:0
}

    .pokeball::before {
        content: "";
        position: absolute;
        height: 50%;
        width: 100%;
        display: block;
        background: red;
        background-image: repeating-linear-gradient(-45deg,rgba(255,255,255,.3),rgba(255,255,255,.5));
        box-shadow: 0 0 1px 1px #666;
    }

    .pokeball::after {
        content: "";
        position: absolute;
        height: 25%;
        width: 25%;
        background: white;
        border: 2px solid #666666;
        box-sizing: border-box;
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
        margin: auto;
        border-radius: 100px;
        z-index: 1;
        background: black;
        background-image: repeating-linear-gradient(-45deg,rgba(255,255,255,.95),rgba(255,255,255,1));
        box-shadow: 0px 0px 0px 13px #f2f2f2,0px 0px 2px 15px #666;
    }

    .pokeball:hover {      
      transform:rotate(360deg);
    }
.pokeball:hover::after{

}