body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: black;
}

header h1 {
    background-color: #f4f4f4;
    display: flex;  
    justify-content: center;
    margin: 0;
}

main {
    background-color: #f4f4f4;
    padding: 3em;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    padding-bottom: 4em;

}

.logo{
    border: 5px solid #000000;  
    border-radius: 15px;         
    width: 200px;                
    height: auto;
    text-align: center;
}            

a {
    background-color: #f4f4f4;
    color: black;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

p{
    background-color: #f4f4f4;
}

.centre{
    padding-top: 2em;
    display: flex;  
    justify-content: center;
    background-image: 
    linear-gradient(to top, #f4f4f4 20%, transparent 20%),  
    linear-gradient(to top, transparent 20%, #03449a 20%); 
    background-size: 100% 100%; 
    background-position: bottom left, top left;
}

img{
    background-color:#f4f4f4;
}

.image_source{
    width: auto;                
    height: 150px;  
}

footer{
    padding-bottom: 16.4em ;
    background-color: #03449a;
}

.un, .deux, .trois{
    display: flex;
    flex-direction: column;
    align-items: center;
}

@keyframes fadeIn {
    0% {
      opacity: 0;
    }
    100% {
      opacity: 1;
    }
  }

 img, p, a, h1 {
    animation: fadeIn 2s ease-in-out;
  }

  @media screen and (max-width: 996px){
   
    main {
        background-color: #f4f4f4;
        display: grid;
        grid-template-columns: 1fr;
        grid-template-rows: 1fr 1fr 1fr;   
        gap: 1em;
        padding: 0;
    }

    .un, .deux, .trois{
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    footer{
        padding-bottom: 8.2em ;
        background-color: #03449a;
    }
}