.formulaire {
    width: 50%;
    margin: auto;
    padding: 50px;
}

#imgload {
    background-image: url('../IMG/LoaderIteachDone.gif');
    min-height: 100%;
    background-position: center;
    background-size: cover;
    position: fixed;
    z-index: 999;
    width: 100%;
}

@media screen and (max-width: 640px) {
    .formulaire {
        width: 100%;
        margin: auto;
    }
}

@media screen and (min-width: 641px) and (max-width: 1024px) {
    .formulaire {
        width: 100%;
        margin: auto;
    }
}