body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f0f0;
}

header {
    background-color: #555555;
    color: white;
    text-align: center;
    padding: 30px 0;
}

h1 {
    font-size: 36px;
    margin: 0;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

.presentation {
    background-color: white;
    border-radius: 5px;
    padding: 20px;
    margin-top: 30px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.presentation img {
    max-width: 100%;
    border: 1px solid #ddd;
}

.presentation h2 {
    color: #333;
    margin-top: 20px;
}

.presentation p {
    color: #666;
    line-height: 1.5;
}

.btn {
    display: inline-block;
    background-color: #555555;
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    border-radius: 4px;
    margin-top: 10px;
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 15px 0;
    margin-top: 30px;
}