Fetch and Display Weather Data of a Region using OpenWeather API

Create a simple weather application using HTML, CSS, and JavaScript that fetches real-time weather data from the OpenWeather API based on user input. The application should allow users to enter a city name, fetch the weather details such as temperature, humidity, and weather conditions, and display them in a visually appealing format.

Key Features:

- Input field for the user to enter a city name
- Fetch weather data using fetch() from the OpenWeather API
- Display temperature, humidity, and weather conditions dynamically
- Basic styling with CSS for a clean UI

Open Weather API : https://openweathermap.org/api