html Table 表头固定的实现

<div class="wrapbox">
     <div class="table-head">
        <table>
            <thead>
                <th width="10%">合同号</th>
                <th width="30%">签约客户</th>
                <th width="20%">发布客户</th>
                <th width="10%">合同状态</th>
                <th width="30%">选定条件的发布周期额度</th>
            </thead>
        </table>
    </div>
    <div class="table-body">
        <table>
            <tbody id="tbody">
            </tbody>
        </table>
    </div>
</div>

   *{
        padding:0;
        margin:0;
    }
    th{
        border:1px solid #e6e6e6;
        line-height: 5vh;
        color:#666666;
        font-size: 16px;
    }
    table {
        border-collapse: collapse;
        width: 100%;
    }
    td {
         padding:5px;
         border:1px solid #e6e6e6;
         font-size: 14px;
    }
    .table-head{padding-right:17px;background-color:rgb(207, 231, 179);color:#000;height:5vh;}
    .table-body{width:100%; height:94vh;overflow-y:scroll;}
    .table-head table,.table-body table{width:100%;}
    .table-body table tr:nth-child(2n+1){background-color:#f2f2f2;}

    .table-body table tr:hover {
        background-color:rgb(240, 249, 228);
        transition: .2s;
    }