Lower border of search bar input container not appearing - React Native

Question

My current search bar looks like this (lower border does not appear).

This is its current code:

<SearchBar
  containerStyle={{
    backgroundColor: "white",
    padding: 10,
    borderBottomColor: "transparent",
    borderTopColor: "transparent",
  }}
  inputContainerStyle={{
    backgroundColor: "white",
    borderWidth: 1,
    borderColor: COLORS.gray,
  }}
  onChangeText={updateBusca}
  lightTheme
  round
  value={busca}
  onSubmitEditing={() => filterGlossary()}
/>

How do I make it appear?

Thanks