html – How to prevent css’ ::after selector from creating a new column in a table

I have a HTML table and I want to add a ::after pseudo-element in the a row (tr) so I can have a border that always stays on top.

However, adding ::after selector creates a new column in the table, even though the position is set to absolute.

css for the tr:

tbody tr {
  display: table-row;
  position: relative;

tbody tr.selected-row::after {
  content: '';

  width: 100%;
  height: 100%;
  position: absolute;
  left: 0px;
  top: 0px;
  border-width: 2px;
  border-color: rgb(59, 130, 246); 

[The table rendered][1]

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