body{
    background-color: #cbcbcb;
    display: flex;
    margin: 0 auto;

}
.nav{
    z-index:99999;
}
.nav .logo{
    position: fixed;
    top: 0px;
    left: 0px;
    display: flex;
    border: 100%;
    color: #c5bebe;
    width: 100%;
    height: 60px;
    background-color: #080808;
    box-shadow: 2px 5px 15px rgb(0,0,0,.7);
}
.nav .logo h1{
    width: 150px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    font-size: 20px;
    text-decoration: none;
    color: rgb(189, 186, 186);
}
.nav .a{
    position: fixed;
    top: 10px;
    right: 10px;
    display: flex;
    box-shadow: 2px 5px 15px rgba(0, 0, 0, 0.7);
    border-radius: 10px;
}
.nav .a a{
    width: 150px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    font-size: 20px;
    text-decoration: none;
    color: rgb(157, 169, 162);
}
.nav .b{
    position: absolute;
    left: 0;
    width: 150px;
    height: 40px;
    border-radius: 10px;
    background-color: rgb(255, 255, 255);
    z-index: -999;
    transition: .5s;
}
.nav .a a:nth-child(1):hover~.b{
    left: 0px;
}
.nav .a a:nth-child(2):hover~.b{
    left: 150px;
}
.nav .a a:nth-child(3):hover~.b{
    left: 300px;
}
.nav .a a:nth-child(4):hover~.b{
    left: 450px;
}
.nav .a a:nth-child(5):hover~.b{
    left: 600px;
}
/* 下拉框样式 */
.dropdown {
    width: 150px;
    height: 40px;
    line-height: 20px;
    text-align: center;
    font-size: 20px;
    text-decoration: none;
    color: rgb(157, 169, 162);
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 150px;
    box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
    z-index: 1;
}

.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
}

.dropdown-content a:hover {
    background-color: #ddd;
}

.dropdown:hover .dropdown-content {
    display: block;
}



.pic .a{
    z-index:99998;
    width: 300px;
    height: 400px;
    position: fixed;
    top: 28%;
    left: 8%;
}
.pic .a:hover .b{
    transform: rotateY(180deg);
}
.pic .b{
    height: 100%;
    background-color: #000;
    display: flex;
    justify-content: center;
    transform-style: preserve-3d;
    background-image: url("../zhou_6ma_res/1.jpg");
    background-size:100% 100%;
    transition: 1.5s;
    box-shadow: 0 0 20px #000;
}
.pic .c,.d{
    position: absolute;
    color: rgba(255,255,255,.8);
    top: 50px;
    left: 20px;
    line-height: 400px;
}
.pic .c{ 
    font:900 60px '';
    letter-spacing: 10px;
    transform:translateZ(70px);
}
.pic .d{
    font:900 20px '';
    letter-spacing: normal;
    transform:translateZ(-70px) rotateY(180deg);
}

.card .a{
    position:absolute;
    top: 13%;
    left: 1%;
    width: 98%;
    height: 83%;
    box-shadow: 0 5px 15px rgba(0,0,0,.8);
    display: flex;
}
.card .c{
    width: 100%;
    height: 100%;
    background-color: rgb(56, 54, 54);
    display: flex;
    justify-content: center;
    align-items: center;
}
.card .d{
    top: 15%;
    left: 33%;
    width: 60%;
}
.card .d h3{
    font: 800 40px '';
    letter-spacing: normal;
    color: #ffffff;
}
.card .d h1{
    font: 800 30px '';
    letter-spacing: normal;
    color: #ffffff;
}
.card .d h2{
    letter-spacing: normal;
    font: 500 15px '';
    color: #ffffff;
}