Add general styles

Update styles.css to add general styles

styles.css

@@ -0,0 +1,91 @@
+body {
+    font-family: 'Arial', sans-serif;
+    background-color: #f4f4f9;
+    color: #333;
+    margin: 0;
+    padding: 0;
+}
+
+.container {
+    max-width: 600px;
+    margin: 50px auto;
+    padding: 20px;
+    background-color: #fff;
+    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
+    border-radius: 8px;
+}
+
+h1 {
+    text-align: center;
+    color: #4CAF50;
+    font-size: 24px;
+}
+
+form {
+    display: flex;
+    flex-direction: column;
+}
+
+.form-group {
+    margin-bottom: 20px;
+}
+
+label {
+    font-size: 16px;
+    margin-bottom: 8px;
+    color: #555;
+}
+
+input[type="text"],
+input[type="number"],
+input[type="date"],
+select {
+    width: 100%;
+    padding: 10px;
+    margin: 5px 0;
+    border: 1px solid #ccc;
+    border-radius: 4px;
+    font-size: 14px;
+    background-color: #f9f9f9;
+}
+
+button.submit-btn {
+    padding: 12px;
+    background-color: #4CAF50;
+    color: white;
+    font-size: 16px;
+    border: none;
+    border-radius: 4px;
+    cursor: pointer;
+    transition: background-color 0.3s ease;
+}
+
+button.submit-btn:hover {
+    background-color: #45a049;
+}
+
+.message {
+    margin-top: 20px;
+    padding: 15px;
+    background-color: #e8f7e8;
+    border: 1px solid #d0f4d7;
+    border-radius: 5px;
+    text-align: center;
+}
+
+.message h3 {
+    color: #4CAF50;
+}
+
+.message p {
+    color: #333;
+}
+
+input[type="text"]:focus,
+input[type="number"]:focus,
+input[type="date"]:focus,
+select:focus {
+    border-color: #4CAF50;
+    outline: none;
+    background-color: #fff;
+}