.center{
    width: 1226px;
    margin: 0 auto;
}

.float_left{
    float: left;
}

.float_right{
    float: right;
}

input{
    outline: none;
}

body{
    height: 10000px;
}

.changdu{
    width: 316px;
    height: 170px;
}