Spring security blocks access to the css files

Question

I am using spring security 3.0.4 and the code below is related to its config. When I run the program, no page contains css code and only the html file is loaded, and the page is messed up. I also used some stackoverflow links(like this), but none of them worked.

@Configuration
public class SecurityConfig {

    public static final String ROLE_PASSENGER = "passenger";

    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http.csrf().ignoringRequestMatchers("/", "/home", "/search", "/search/page")
                .and().authorizeHttpRequests()
                .requestMatchers("/reserve-flight", "/panel").authenticated()
                .requestMatchers("/", "/home", "/search/**").permitAll().and()
                .formLogin().loginPage("/login").permitAll().defaultSuccessUrl("/panel")
                .failureUrl("/login?error=true").and().logout().permitAll()
                .logoutSuccessUrl("/login?logout=true").invalidateHttpSession(true);
        return http.build();

    }

    @Bean
    public BCryptPasswordEncoder getEncoder() {
        return new BCryptPasswordEncoder();
    }
}

Authprovider:

@Component
public class UserPassAuthProvider implements AuthenticationProvider {
    private final PassengerDetailsService passengerDetailsService;
    private final PasswordEncoder encoder;

    public UserPassAuthProvider(PassengerDetailsService passengerDetailsService, PasswordEncoder encoder) {
        this.passengerDetailsService = passengerDetailsService;
        this.encoder = encoder;
    }

    @Override
    public Authentication authenticate(Authentication authentication) throws AuthenticationException {
        String email = authentication.getName();
        String password = authentication.getCredentials().toString();
        PassengerDetails passenger = passengerDetailsService.findByEmailAddress(email);
        if (passenger != null && encoder.matches(password, passenger.getPassword())) {
            return new UsernamePasswordAuthenticationToken(email, null, Collections.singleton(() -> ROLE_PASSENGER));
        }
        return null;
    }

    @Override
    public boolean supports(Class<?> authentication) {
        return UsernamePasswordAuthenticationToken.class.equals(authentication);
    }
}

homepage: