table{
  width: 100%;
}
th,td{
  height: 100px;
  vertical-align: middle;
  padding: 0 15px;
  border: 1px solid #ccc;
}
.fixed01{
  position: sticky;
  top: 0;
  color: #fff;
  background: #333;
  &:before{
    content: "";
    position: absolute;
    top: -1px;
    left: -1px;
    width: 100%;
    height: 100%;
    border: 1px solid #ccc;
  }
}