#tblcontent{
    overflow:auto;
    width:100%;
    height:84vh; /* 固定高度 */
}
/*
table#ShowTable td, th {
    border-bottom:1px gray solid;
}
*/
table#ShowTable th, table#ShowTable1 th, table#ShowTable2 th { background-color:#555555; }
table#ShowTable {
    /*table-layout: fixed;*/
    width: 100%;
    min-width: 350px;
}
table#ShowTable1 {width: 100%;min-width: 350px;}
table#ShowTable2 {width: 100%;min-width: 350px;}

table#ShowTable td:first-child,th:first-child{
    position:sticky;
    left:0; /* 首行永遠固定於左 */
    z-index:1;
    /*background-color:#000000;*/
    background-color:inherit;
}
table#ShowTable1 td:first-child,th:first-child{ position:sticky; left:0; z-index:1; background-color:#000000; }
table#ShowTable2 td:first-child,th:first-child{ position:sticky; left:0; z-index:1; background-color:#000000; }

table#ShowTable thead,tr,th {
    position:sticky;
    top:0; /* 列首永遠固定於上 */
}
table#ShowTable1 thead,tr,th { position:sticky; top:0; }
table#ShowTable2 thead,tr,th { position:sticky; top:0; }

table#ShowTable th:first-child { z-index:2; }
table#ShowTable tbody { z-index:1; }
table#ShowTable thead { z-index:2; }

table#ShowTable1 tbody { z-index:1; }
table#ShowTable1 thead { z-index:2; }

table#ShowTable2 tbody { z-index:1; }
table#ShowTable2 thead { z-index:2; }