html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    text-align: center;
}

body {
    display: flex;
    flex-direction: column;
    font-family: Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    background-color: #f5f5f5;
    color: #333333;
}

header {
    background-color: #4CAF50;
    color: white;
    padding: 20px 0;
}

.content {
    flex: 1;
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

footer {
    background-color: #4CAF50;
    color: white;
    padding: 10px 0;
}

a {
    color: #1a0dab;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.button:hover {
    background-color: #45a049;
}

h2, h3 {
    color: #4a4a4a;
    margin-top: 1em;
    margin-bottom: 0.5em;
}

h1 {
    font-size: 2em;
}

h2 {
    font-size: 1.5em;
}

p {
    line-height: 1.6;
}


.button {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

#gpt-challenge, #featured {
    background-color: #f0f0f0;
    padding: 20px;
    margin: 20px 0;
    border-radius: 8px;
}

#gpt-challenge h2, #featured h2 {
    color: #333;
    margin-bottom: 15px;
}

#gpt-challenge p, #gpt-challenge ul, #featured p, #featured ul {
    color: #666;
    line-height: 1.6;
}

#gpt-challenge ul, #featured ul {
    list-style-type: none;
    padding-left: 0;
}

#gpt-challenge li, #featured li {
    margin-bottom: 10px;
}

#gpt-challenge a, #featured a {
    color: #1a0dab;
    text-decoration: none;
}

#gpt-challenge a:hover, #featured a:hover {
    text-decoration: underline;
}

/* Responsive Styles */
@media screen and (max-width: 768px) {
    .content {
        padding: 0 10px;
    }

    header, footer {
        padding: 10px 0;
    }
}

@media screen and (max-width: 480px) {
    header h1 {
        font-size: 1.5em;
    }
}