yii2 GridView固定表头 简单方法

table tbody {  
    display:block;  
    height:500px;  
    overflow-y:scroll;  
}  
  
  
table thead, tbody tr {  
    display:table;  
    width:100%;  
    table-layout:fixed;  
}  
  
  
table thead {  
    width: calc( 100% - 1em )  
}