body{
        min-width: 1280px;
        min-height: 920px;
        position: relative;
        padding-bottom: 220px;
    }
    *{
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }
    ul{
        list-style: none;
    }
    a:link,
    a:visited,
    a:hover,
    a:active {
        text-decoration: none !important;
        border: 0;
        color: #333 ;
    }
    :root{
        --blue1:#003a8c;
        --blue2:#0050b3;
        --blue3:#096dd9;
        --blue4:#69c0ff;
        --yellow:#DEFF00;
        --gray:#444546;
    }
    .head_img{
        width:1280px;
        height: 100px;
        margin: 0 auto;
        display: flex;
    }
    .head_logo{
        width: 96px;
        margin-left: 20px;
    }
    .head_img img{
        width: 100%;
        margin-top: 26px;
    }
    
    .navigation {
        width: 100%;
        height: 50px;
        line-height: 50px;
        background-color: var(--blue1);
        background-image: -webkit-linear-gradient(top,var(--blue1),var(--blue2));
        background-image: -moz-linear-gradient(top,var(--blue1),var(--blue2));
        background-image: -o-linear-gradient(top,var(--blue1),var(--blue2));
        background-image: linear-gradient(top,var(--blue1),var(--blue2));
    }
    .container-magin {
        width: 1280px;
        min-width: 1280px;
        margin: 0 auto;
        position: relative;
    }
    .itemb ul li {
        float: left;
        height: 50px;
        text-align: center;
        margin-top: 0px;
        margin-right: 20px;
        padding: 0 30px;
    }
    .item_box {
        border: 1px solid var(--blue3);
        background-color: var(--blue3);
        color: #fff;
    }
    .itemb a {
        position: relative;
        display: block;
        color: #fff;
        text-align: center;
        font-size: 16px;
        height: 50px;
        line-height: 50px;
        text-decoration: none;
        cursor: pointer;
    }
    
     .itemb .item_box>a:hover{
        text-decoration: none;
        color:  #fff;
    }
    .itemb a:hover{
        text-decoration: none;
        color:  var(--blue3);
    }
    .header-search {
        position: absolute;
        top: 0px;
        width: 268px;
        height: 45px;
        right: 20px;
    }
    .header-input {
        width: 100%;
        border: 0;
        outline: 0;
        height: 30px;
        line-height: 30px;
        padding-left: 20px;
        background-color: transparent;
        border-radius: 20px;
        color: #fff;
        font-size: 12px;
        border: 1px solid  #fff;
    }
    .header-input::-webkit-input-placeholder {  
			 color: #fff;
	}
    .header-input::-moz-placeholder {   
		 color: #fff;
	}
    .header-input:-ms-input-placeholder {  
	  color: #fff;
	}
    .header-input:-moz-placeholder {  
	  color: #fff;
	}
    .header-button {
        width: 50px;
        height: 29px;
        cursor: pointer;
        position: absolute;
        top: 20px;
        right: -10px;
        margin-top: -20px;
    }
    .head_btn{
        width: 50px;
          height: 30px;
          position: absolute;
          top:10px;
          left:-10px;
          border-bottom-right-radius: 15px;
          border-top-right-radius: 15px;
          border: none;
          background-color: transparent;
          
    }
    button:actived{
        border:none;
        outline: none;
    }
    .tac{
     text-align: center;   
    }
    .pl10 {
    padding-left: 10px;
}
.plr20{
    padding: 0 20px;
}
.pr10 {
    padding-right: 10px;
}
.fs16 {
    font-size: 16px;
}
.dp-b {
    display: block;
}
.mr10 {
    margin-right: 10px;
}
.mr20 {
    margin-right: 20px;
}
.ml10 {
    margin-left: 10px;
}
.mt10{
    margin-top: 10px;
}
.mt20{
    margin-top: 20px;
}
.mb20{
    margin-bottom: 20px;
}