body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 20px;
}

.diaporama {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
    height: 500px;
}

.slide {
    display: none;
    position: absolute;
    width: 100%;
    height: 100%;
}

.slide img {
    max-width: 100%;
    max-height: 100%;
    display: block;
    margin: 0 auto;
}

button {
    padding: 10px 20px;
    margin: 10px;
    cursor: pointer;
    font-size: 16px;
}