* {
    padding: 0;
    margin: 0;
}

a {
    text-decoration: none;
}

.top {
    height: 60px;
    width: 100%;

}

.top_1 {
    height: 60px;
    width: 1300px;
    margin: 0 auto;

}

.nav {
    height: 50px;
    width: 100%;
    background-color: #2577E3;
    position: relative;
}

.nav_1 {
    height: 50px;
    width: 1300px;
    margin: 0 auto;
}

.nav_bottom {
    height: 57px;
    width: 100%;
}

.nav_bottom_1 {
    height: 57px;
    width: 1300px;
    margin: 0 auto;
    overflow: hidden;
}

.return {
    height: 340px;
    width: 100%;
    margin: 0 auto;
    position: relative;
    overflow: hidden;

}

.bottom {
    height: 470px;
    width: 100%;

    background-color: #f6f6f6;
}

.bottom1 {
    height: 470px;
    width: 1300px;
    margin: 0 auto;
}

.foot {
    height: 300px;
    width: 100%;
    background-color: #fff;
}

.foot1 {
    height: 300px;
    width: 1300px;
    margin: 0 auto;

}