* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: #f0f0f0;
}

.container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background: #fff;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}

h2 {
    margin-bottom: 20px;
    color: #333;
    text-align: center;
}

.textbox {
    margin-bottom: 15px;
}

.textbox input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.btn {
    width: 100%;
    padding: 10px;
    border: none;
    background: #333;
    color: #fff;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

.btn:hover {
    background: #555;
}

@media (max-width: 480px) {
    .login-box {
        padding: 15px;
    }

    .btn {
        padding: 8px;
        font-size: 14px;
    }

    .textbox input {
        padding: 8px;
    }
}