header {
    background: url(../img/sy-bg2.jpg) no-repeat center center;
    background-size: auto 100%; 
    height: 270px;
}
header .d-links{
    padding-top: 50px;
    color: #555;
}
header .d-links a {
    color: #555;
}
nav {
    margin-bottom: 20px;
}
.p-pos {
    margin-bottom: 26px;
}
.d-flex {
    display: flex;
    justify-content: space-between;
}
.part2__con__left {
    
    width: 200px;
}
.part2__con__right {
    padding-top: 5px;
    width: 970px;
}
.part3__con {
    flex-wrap: wrap;
}
.part3__con::after {
    content: '';
    width: 387px;
}
.part3__con a {
    margin-bottom: 15px;
}
.part4 p {
    margin-bottom: 45px;
}
.part5__con p {
    margin-bottom: 25px;
}
.part7__con p {
    margin-bottom: 45px;
}
.page {
    margin-top: 50px;
    text-align: center;
}
.arc-tit {
    margin-top: 40px;
    margin-bottom: 40px;
    line-height: 42px;
    font-size: 30px;
    text-align: center;
}
.arc-con {
    line-height: 45px;
}
.arc-con p {
    margin: 15px 0;
}
.arc-con img {
    display: block;
    margin: 0 auto;
    max-width: 100%;
}