pseudo.js

const StyledButton = styled.button`
  border: 2px solid green;
  background-color: ${(props) => (props.variant !== "outline" ? "white" : "green")};
  color: ${(props) => (props.variant === "outline" ? "green" : "white")};
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  font-size: 16px;
  cursor: pointer;

  // hover styles
  &:hover {
    background-color: ${(props) => (props.variant !== "outline" ? "white" : "green")};
    color: ${(props) => (props.variant !== "outline" ? "green" : "white")};
  }
`;