.fn_1{
    width: 180px; height: 130px;
    background: url(images/fn2.png);
    background-size: contain;
    background-repeat:no-repeat;
    background-position: center;
}
.fn_1:hover{
    background: url(images/fn1.png);
    background-size: contain;
    background-repeat:no-repeat;
    background-position: center;
}

.fn_2{
    width: 180px; height: 130px;
    background: url(images/fn2.png);
    background-size: contain;
    background-repeat:no-repeat;
    background-position: center;
}
.fn_2:hover{
    background: url(images/fn1.png);
    background-size: contain;
    background-repeat:no-repeat;
    background-position: center;
}

.fn_3{
    width: 250px; height: 220px;
    background: url(images/fn_3.png);
    background-size: contain;
    background-repeat:no-repeat;
    background-position: center;
}
.fn_3:hover{
    background: url(images/fn_3_h.png);
    background-size: contain;
    background-repeat:no-repeat;
    background-position: center;
}

.sci-wheel{
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
}

.header{
    width: 100%; height: 100px; line-height: 100px;
    padding: 0 40px;
    background:rgba(0,0,0,0.3);
}
.header img{
    float: left;
    margin: 10px 10px;
    width: 100px;
}
.header p{
    float: left;
    font-size: 30px; color: white;
    letter-spacing: 3px;
}
.header .home-btn {
    float: left;
    margin-top: 20px;
    width: 74px;
    height: 74px;
    border: 1px solid #102262;
    border-radius: 5px;
    background: url(images/login/icon.png) no-repeat center center;
    background-size: 45% 45%;
    cursor: pointer;
}
.center{
    position: absolute;
    top: 11em; bottom: 0; left: 0; right: 0;
    margin: auto;
    width: 100%; height: 250px;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
}
.center .list{
    display: block;
    float: left;
    margin: 0 30px;
}
.center .list h4{
    text-align: center;
    color: #fff;
    font-size: 1.2em;
    margin-top: 2.4em;
    font-weight: bolder;
}