mat.services/sass/style/parts/_table.scss

table {
  border-spacing: 0;
  border-collapse: collapse;
}

table th {
  padding: 6px 13px;
  border: 1px solid #dfe2e5;
  font-size: large;
}

table td {
  padding: 6px 13px;
  border: 1px solid #dfe2e5;
}