body{
background-color: black;
}

#logo {
background-color:white; 
width: 1000px; 
height: 500px; 
position: absolute;
margin-top: -250px;
margin-left: -500px;
top: 48%;
left: 50%;
border:1px solid silver;
}

#texte{ border:1px solid black;
width: 800px; 
height: 55px; 
position: absolute;
margin-top: -25px;
margin-left: -400px;
bottom:2%;
left: 50%;
text-align: center;
}

#texte p { 
font-family: Arial; 
font-size: 11px; 
color:white;
}

a {
color: yellow;
}

<!---#extra{position: absolute; width:150px; height: 100px; margin:300px; border:1px solid blue;}-->