How to style tabs like pills - INTERNAL

Store with this example live:

https://evara-wear.com/products/leak-proof-underwear-that-wont-let-you-down-for-women-55-4-pack

.sizechart_title {
  display: none !important;
}
@media (max-width: 768px) {
  .MuiTabs-scrollableX {
    width: 330px !important;
  }
}
.smartsize-modal > div:has(.smartsize-tabs) {
  display: flex !important;
  justify-content: center !important;
  align-items: center !important;
  padding: 0 !important;
  margin: 50px auto !important;
  width: 100% !important;
  background: transparent !important;
}
.smartsize-modal .smartsize-tabs {
  margin: 0 auto !important;
  display: flex !important;
  justify-content: center !important;
}
.smartsize-tabs {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: #eeeced;
  border: 2px solid #3b3135;
  border-radius: 9999px;
  padding: 10px;
  gap: 4px;
  width: fit-content;
  margin: 0 auto;
}
.smartsize-tab {
  flex: 1;
  text-align: center;
  border-radius: 9999px;
  padding: 6px 16px;
  background: transparent !important;
  color: #3b3135;
  font-weight: 700;
  font-family: "Georgia", serif;
  cursor: pointer;
  border: none;
  outline: none;
  transition: all 0.25s ease-in-out;
}
.smartsize-tab:hover {
  background-color: rgba(59, 49, 53, 0.08);
}
.smartsize-tab.active,
.smartsize-tab[aria-selected="true"] {
  background-color: #3b3135 !important;
  color: #ffffff !important;
  box-shadow: none !important;
  border: none !important;
  outline: none !important;
  text-decoration: none !important;
}
.smartsize-tab *,
.smartsize-tab.active *,
.smartsize-tab[aria-selected="true"] * {
  text-decoration: none !important;
}
.MuiTabs-indicator {
  display: none !important;
}