.box {
    padding: 20px;
    width: 982px;
    height: 270px;
    margin: 0 auto;
    margin-top: 50px;
    margin-bottom: 200px;
}
a {
text-decoration: none;
}
.box h1{
    margin-left: 20px;
    text-align: left;

}
.smallbox {
width: 235px;
height: 270px;
margin-left: 14px;
margin-top: 30px;
float: left;
background-color: #fff;
/* css3效果过渡 */
transition: all .2s linear;
}

.box .smallbox img {
    
height: 160px;
margin: 0 37.5px 12px; 
}
.box .smallbox h4 {
margin: 10px 10px 2px;
color: #333333;
font-size: 14px;
font-weight: 400;
text-align: center;
}
.box .smallbox .conten {
font-size: 12px;
color: #b0b0b0;
text-align: center;
margin: 0 auto;
}

.smallbox:hover {
/* 盒子阴影 */
box-shadow: 4px 20px 40px 5px rgba(0, 0, 0, .1); 
/* 盒子向上移动效果，改变上外边距 */
margin-top: 20px;
}
.box .aa {
margin-left: 0;    
}

.box .gengduo{
    display: block;
    text-align: right;
    text-decoration: none;
    margin-top: 300px;
    margin-bottom: 300px;
    padding: 30px 80px; 
  font-size: 20px;
  color: rgb(255, 248, 248);  
  font-family: Tahoma;
}