form {
    display:flex;
    border:solid white 3px;
    padding:10px;
    border-radius:15px;
    flex-direction:column;
    align-items:center;
    width:30vw;
    margin:auto;
}

input:not([type="submit"]) {
    height:5vh;
}

textarea {
    height:10vh;
}

input:not([type='submit']),textarea{
    margin-bottom:5vh;
    background-color:black;
    color:white;
    border:white solid 2px;
    border-radius:15px;
    width:20vw;
}

.niveau2 {
    margin:auto;
}