main {
    text-align: center;
}

#sign-in-form,
#new-account-form {
    margin-left: 20%;
    margin-right: 20%;
    display: grid;
    gap: 1em;
    grid-template-columns: 1fr 2fr;
}

input[type="submit"] {
    grid-column-start: 1;
    grid-column-end: -1;
    justify-self: center; /* Centre horizontalement */
}

@media all and (max-width: 800px)
{
    /*Pour les mobiles seulement*/
    #sign-in-form,
    #new-account-form{
        margin-left: 0%;
        margin-right: 0%;
    }
}