.speed-chart th, .speed-chart td { min-width: 0; }
.speed-chart th:first-child, .speed-chart td:first-child { width: 2rem; }
.speed-chart th:nth-child(2), .speed-chart td:nth-child(2) { min-width: 140px; }
.speed-chart th:nth-child(3), .speed-chart td:nth-child(3),
.speed-chart th:nth-child(4), .speed-chart td:nth-child(4) { min-width: 62px; }
.speed-chart th:nth-child(5), .speed-chart td:nth-child(5),
.speed-chart th:nth-child(6), .speed-chart td:nth-child(6) { min-width: 110px; }
@media (max-width: 600px) {
  .speed-chart th, .speed-chart td { padding: .5rem .35rem; }
}