@media screen and (min-width: 900px) {
body{
    max-width: 1920px;
    max-height: 1500px;
    margin: 0 auto;
    position: relative;
    background: url(../imger/bg1.png) no-repeat center top;
	background-color: #D0D4DA;
}
body>div{
  width: 100%;
  overflow: hidden;
  min-width: 1000px;
}
.header{
    transition: background-color 0.3s;
    background:rgba(255,255,255,1);
    width: 1200px;
    margin:0px auto;
    height:76px;
    padding:0px 360px;
    animation: headerbox 1s both ease-in-out;
    position: relative;
}
.logo{
    width:350px;
}
.logobox{
    float:left;
}
.headernav{
    display:flex;
    float:right;
}
.headernav01{
    margin: 0 20px;
    text-align:center;
    line-height: 76px;
    position: relative;
}
.headernav01:hover:before {
    display: inline-block;
    content: "";
    height: 2px;
    width: 100%;
    background: rgb(89,148,242);
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}
.headernav01:hover a{
    color: rgb(89,148,242);
}

.header ul li a{
    display: block;
    font-size: 15px;
    color: #000;
    transition:all 0.3s;
}
}