.four_cicle{
        background: #3899E2;
        width:500px;
        height:500px;
        border-radius:50%;
        margin:0 auto;
        box-shadow: 10px 15px 50px rgba(0,0,0,0.6),0 0 50px rgba(100,10,20,0.5) inset;
         /*css动画*/
        transition: border-radius 1s;
        -moz-transition: border-radius 1s;  /* Firefox 4 */
        -webkit-transition: border-radius 1s;   /* Safari 和 Chrome */
        -o-transition: border-radius 1s;
    }
    .four_cicle:hover{
        border-radius:5px 25%;
    }
    .four_text{
        font-size:180px;
        font-family: "微软雅黑";
        font-weight: bold;
        color:#fff;
        width: 500px;
        line-height: 500px;
        text-align: center;
        text-shadow: 0 0 50px rgba(0,0,0,0.6);
    }
    
    .four_left{
        display: inline-block;
        -webkit-transform: rotate(-30deg);
        transform: rotate(-30deg);
    }
    .four_right{
        display: inline-block;
        -webkit-transform: rotate(-37deg);
        transform: rotate(-37deg);
    }
    .four_warm{
        color:#888;
        font-size:60px;
        text-align: center;
        margin-top:30px;
        font-weight: bold;
    }
    .four_sorry{
        color:#3899E2;
    }
    .four_go{
        width:300px;
        display:block;
        text-align: center;
        margin:0 auto;
        font-size:30px;
        color:#fff;
        background:#3899E2;
        line-height: 50px;border-radius: 10px;
        cursor: pointer;
        text-decoration: none;
        box-shadow: 10px 10px 30px rgba(0,0,0,0.5);
    }
    .four_go:hover{
        background: rgb(211,47,47);
        color:#fff;
    }
    .four_content{min-height:220px;margin: 30px 0;}