table 头部固定

.table {
        height: 310px;
    }

    table tbody {
        display: block;
        max-height: 270px;
        overflow-y: auto;
    }
    
    table thead,
    tbody tr {
        display: table;
        width: 100%;
        table-layout: fixed;
    }
    
    table thead {
        width: 100%;
    }


    .table tbody tr:last-child {
        border-bottom: none;
    }

    .table thead>tr>th:nth-of-type(2),.table tbody>tr>td:nth-of-type(2) {
        width: 270px;
    }