body {
    font-family: Arial, sans-serif;
    background-color: #f2f2f2;
    box-sizing: border-box;
}

form {
    max-width: 400px;
    margin: auto;
    padding: 20px;
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h3 {
    font-size: 24px;
    text-align: center;
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 10px;
}

input[type="text"],
input[type="password"] {
    display: block;
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    margin-bottom: 20px;
    box-sizing: border-box;
}

input[type="submit"] {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 20px;
    min-width: 175px;
}

.btn-theme {
    display: inline-block;
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 20px;
    text-align: center;
}

.btn-center {
    display: flex;
    justify-content: center;
}

a {
    text-decoration: none;
    color: #4CAF50;
}

p {
    text-align: center;
    margin-top: 20px;
}