scroll -y bar not coming for the table

Question

I am working on a table where I need scroll bar after 5th column. I was trying but not able to get that.

Here is my entire code in stackblitz ink.

How can I get overflow y scroll bar after 5th column and in the last row? The row is alone dynamic. But this is not happening.

 .sampletable > table{
    overflow-x: scroll
  }