Why am I unable to apply a border to an angular mat-table row?

Question

I have a simple angular material table:

<table mat-table [dataSource]="scoreboardData">
    <ng-container matColumnDef="name">
      <th mat-header-cell *matHeaderCellDef> Name </th>
      <td mat-cell *matCellDef="let element"> {{element.name}} </td>
    </ng-container>
    <ng-container matColumnDef="totalScore">
      <th mat-header-cell *matHeaderCellDef> Total Score </th>
      <td mat-cell *matCellDef="let element"> {{element.totalScore}}</td>
    </ng-container>
    <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
    <tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>

I would like to add some extra margin between the rows as well as a border and maybe even some padding. I have found that I am able to change the background color of the rows, but I'm not able to apply margins, padding or borders to the row.

tr.mat-row {
    background: #2f5b98; /* Old browsers */
    background: -moz-linear-gradient(top, rgba(74,144,239,1) 20%, rgba(0,0,0,1) 100%); /* FF3.6-15 */
    background: -webkit-linear-gradient(top, rgba(74,144,239,1) 20%,rgba(0,0,0,1) 100%); /* Chrome10-25,Safari5.1-6 */
    background: linear-gradient(to bottom, rgba(74,144,239,1) 20%,rgba(0,0,0,1) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#4a90ef', endColorstr='#000000',GradientType=0 ); /* IE6-9 */

    margin-top: 16px;
    padding: 8px;
    border: 1px solid #FAFF00;
}

I'm sure it's something simple, but I can't figure out what is preventing me from applying these styles to the row. Again, I can change the background, the font within it and several other styles, just not these three particular styles (padding, margin, border).

EDIT: I have since determined that padding and margin are not allowed on any html tables. Border still eludes me though.

Answer 1

mat-footer-row, mat-header-row, mat-row {
  border-bottom-width: 10px;
}

try this code. This will work :)