body {
width :800px ;
background :black ;
margin :auto ;
color :orange ;
} 

nav {
display :flex;
justify-content :center;



}

.infobulle span{
 	 margin-top:23px;
 	 margin-left:-35px;
 	 position:absolute;
 	 color:#09c;
 	 background:rgba(0,50,0,.9);
 	 padding:15px;
 	 border-radius:3px;
 	 box-shadow:0 0 2px rgba(0,0,0,.5);
 	 transform:scale(0) rotate(-12deg);
 	 transition:all .25s;
	}
.infobulle:hover span, .infobulle:focus span{
 	 transform:scale(1) rotate(0);
	}

.conteneur{
 display:grid;
 grid-template-columns: 1fr 2fr 1fr;
 grid-template-rows:
repeat(2,minmax(300px,1fr))
}


.first25{
 grid-column: 1 / 2;
 margin:5px;
 background-color: #990011;
}
.first25Down{
 grid-column: 1 / 2;
 grid-row:2/3;
 margin:5px;
 background-color: #990011;
}

.img2 {
max-width :20%;
}
.img2:hover{
max-width : 50%
}