body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif, sans-serif;
    font-size: 14px;
    text-align: center;
    background-image: url(https://kingmateriaux.com/wp-content/uploads/2023/01/galet-gris.png);
    background-repeat: no-repeat;
    background-size: cover; 
    display: flex; 
    flex-direction: column; 
    min-height: 100vh; 
}

h1 {
    text-align: center;
    border: 2px solid #808080; 
    background-color: #d3d3d3; 
    border-radius: 10px; 
    padding: 10px;
    text-decoration: none; 
    display: inline-block; 
}

a {
    text-decoration: none;
    color: black;
}

a:hover {
    color: #b51717; 
}

p {
    text-align: center;
    background-color: #d3d3d3; 
    border-radius: 10px; 
    padding: 20px;
    border: 2px solid #808080; 
    margin: 20px; 
}