body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f0f0;
}

.container {
    background-color: #fff;
    padding: 30px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    max-width: 400px;
    width: 100%;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
}

input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 3px;
    box-sizing: border-box;
}

.btn {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn:hover {
    background-color: #3e8e41;
}

.error-message {
    color: red;
    font-weight: bold;
    margin-top: 10px;
}

/* Media queries for responsive design */
@media only screen and (max-width: 600px) {
    .container {
        padding: 20px;
    }
}