html, body {
    margin: 0;
    min-height: 100%;
    font-family: 'Saira', sans-serif; 
    background-color: #eee;
    
    /* 1. Autorise le scroll */
    overflow-y: auto; 
    overflow-x: hidden;

    /* 2. Cache la scrollbar sur Firefox */
    scrollbar-width: none; 

    /* 3. Cache la scrollbar sur IE et Edge */
    -ms-overflow-style: none; 

}

/* 4. Cache la scrollbar sur Chrome, Safari et Opera */
body::-webkit-scrollbar {
    display: none;
}

#center{
    align-items: center;
    display: flex;
    justify-content: center;
}


#back {
    position: fixed;
    top: 40px;
    left: 40px;
    height: 50px;
    width: auto;
    text-decoration: none;
    color: #111;
    z-index: 1000;
}


#back:hover {
    opacity: 0.7;
    animation: bounce 1s  ease-in-out;
}

.contenu {
    background:#eee;
    color:#111;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-size: 150%;
    margin-top: 2em;
    margin-bottom: 2em;
    width: 70%;
}
    
p{
    margin-top: 2em;
    margin-bottom: 2em;
}

img{
    height: 50%;
    width: auto;
    border-radius: 5%;
}

@keyframes bounce {
    0%{transform:translateX(0);}
    50%{transform:translateX(-12px);}
    100%{transform:translateX(0);}
}