JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
    <title>Route Finder</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.9.4/leaflet.css" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.9.4/leaflet.js"></script>
    <style>
        .container {
            max-width: 800px;
            margin: 20px auto;
            padding: 20px;
            font-family: system-ui, -apple-system, sans-serif;
        }
        .input-group {
            margin-bottom: 15px;
        }
        input {
            width: 100%;
            padding: 8px;
            margin-bottom: 10px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        button {
            background-color: #0066cc;
            color: white;
            padding: 10px 20px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        }
        button:disabled {
            background-color: #cccccc;
        }
        #map {
            height: 400px;
            margin: 20px 0;
            border-radius: 8px;
        }
        .error {
            color: red;
            margin: 10px 0;
            padding: 10px;
            background-color: #ffebee;
            border-radius: 4px;
        }
        .route-info {
            margin-top: 15px;
            padding: 15px;
            background-color: #f5f5f5;
            border-radius: 4px;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>Route Finder</h1>
        <div class="input-group">
            <input type="password" id="apiKey" placeholder="OpenRouteService API Key" />
            <input type="text" id="startLocation" placeholder="Starting location" />
            <input type="text" id="endLocation" placeholder="Destination" />
            <button id="findRoute" disabled>Find Route</button>
        </div>
        <div id="error" class="error" style="display: none;"></div>
        <div id="map"></div>
        <div...