body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #F5F5F5;
    color: #616161;
    text-align: center;
}

.navbar {
    background-color: #4CAF50;
    border-bottom: 1px solid #616161;
    padding: 10px 20px;
    display: flex;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar .logo {
    height: 40px;
    margin-right: 20px;
}

.navbar ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 20px;
    margin-left: auto;
}

.navbar li {
    margin: 0;
}

.navbar a {
    color: #F5F5F5;
    text-decoration: none;
    font-weight: 600;
    padding: 5px 10px;
    border-radius: 4px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.navbar a:hover {
    background-color: #388E3C;
    color: #F5F5F5;
}

.container {
    padding-top: 50px;
}

h1 {
    color: #388E3C;
}

form {
    background: #C8E6C9;
    padding: 20px;
    border-radius: 8px;
    display: inline-block;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="submit"] {
    margin: 5px;
    padding: 8px;
    border-radius: 4px;
    border: 1px solid #616161;
}

input[type="submit"] {
    background-color: #4CAF50;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

input[type="submit"]:hover {
    background-color: #388E3C;
}

.error {
    color: #FF4136;
}