header{
    padding: 5px 0;
}
header img {
    width: 40%;	float:left;	margin-right:10px;
}
.mingcheng {
    padding: 5px 10px;
    font-size: 14px;
}

nav ul li {
    width: 25%;
    line-height: 0.4rem;
    float: left;
    background: #FF7F00;
    border-bottom:0.01rem solid #FF9D3D;
    border-right:0.01rem solid #FF9D3D;
}

nav ul li a {
    color: #fff;
    display: inline-block;
    width: 100%;
    height: 100%;
    padding: 0 0.15rem;
    box-sizing: border-box;
    font-size: 0.14rem;
    cursor: pointer;
}