body {
    font-family: 'Open Sans', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #121212; /* Dark background */
    color: #e0e0e0; /* Light text color */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

.navbar {
    width: 100%;
    background-color: #1f1f1f; /* Darker navbar background */
    padding: 10px 20px;
    position: fixed;
    top: 0;
    left: 0;
    display: flex;
    align-items: center;
    border-bottom: 1px solid #333; /* Optional border for separation */
}

.logo img {
    height: 60px;
}

.container {
    text-align: center;
    margin-top: 100px;
}

h1 {
    font-size: 24px;
    color: #e0e0e0; /* Light text color */
    margin-bottom: 20px;
}

.checkmark {
    font-size: 48px;
    color: #fff; /* White color for the checkmark itself */
    background-color: #4caf50; /* Green background */
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

@media (max-width: 600px) {
    .navbar {
        flex-direction: column;
        align-items: center;
    }

    .logo img {
        height: 60px;
    }

    .container {
        margin-top: 80px; /* Adjust top margin for smaller screens */
        padding: 0 40px; /* Increased left and right padding for mobile */
    }

    h1 {
        font-size: 20px;
    }

    .checkmark {
        width: 60px;
        height: 60px;
        font-size: 36px;
    }
}