/*表格基本样式 */
table{
    width: 100%;
    border: 1px solid black;
    margin: 0 auto;
    border-spacing: 0px;
    border-collapse: collapse;

}
th,tr,td{
    border: 1px solid black;
}
td{
    height: 50px;
    text-align: center;
    vertical-align: middle;
}