body{
    background: url(../img/heard/body_bg.jpg);
    background-repeat: repeat-x;
    background-position: top;
}
.heard{
    width: 1000px;
}
.banner{
    width: 100%;
    height: 158px;
    position: relative;
}
.banner>img{
    width: 100%;
}
.back_hp{
    width: 65px;
    height: 27px;
    position: absolute;
    top: 0;
    right: 44px;
}
.back_hp>a{
    display: block;
}
.nav{
    width: 100%;
    background: url("../img/heard/nav_bg.jpg") repeat-x;
}
.nav ul{
    display: flex;
    justify-content: space-between;
    color: #ffffff;
}
.nav>ul>li{
    cursor: pointer;
    position: relative;
}

.nav>ul>li:hover{
    background: url("../img/heard/nav_bg_gray.jpg") repeat-x;
}
.nav .one_cd{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0 20px;
}
.nav a>.one_cd{
    color: #ffffff;
}
.nav>ul>li:hover  .two_cd{
    display: block;
}
.nav .one_cd>:nth-child(1){
    line-height: 44px;
}
.nav .one_cd>:nth-child(2){
    line-height: 18px;
    font-family: Arial;
}
.nav .two_cd{
     display: flex;
     flex-direction: column;
}
.nav .xs{
    width: 100%;
    display: none;
    position: absolute;
    z-index: 1000;
}
.nav .two_cd>li{
    text-align: center;
    line-height: 43px;
    background: #8c8a8b;
    border-bottom: 1px solid #ffffff;
}
.nav .two_cd>li:hover{
    background: #747273;
}
.nav .two_cd>li>a{
    display: block;
    color: #ffffff;
}