body {
    background-image: url("bg.png");
}

.main-container{
    width:100vw;
}

.formulaire{
    width:100vw;
    margin:0 auto;
    text-align: center;
    margin-top: 25vh;               /* poussé dd'un quart de la hauteur de viewport */
    font-family: verdana;
    font-size:16px;    
}

::placeholder{
    text-align:center;
    font-family:verdana;
}

.label{
    font-family: verdana;
    margin-bottom: 4px;
}

input{
    text-align:center;
    font-family: verdana;
    font-size:16px;
}
button{
    margin-top:15px;
}
.h2{
    width:50vw;
    margin:0 auto;
    text-align: center;
    margin-top: 10px;               
    font-family: verdana;
    font-size: 24px;
    font-weight: bold;
    color:red;
}

@media screen and (max-width: 1280px) and (orientation: portrait)
    {
        input,.label{
            font-size:38px;
        }

        button{
            margin-top: 30px;
            font-size:38px;
        }
    }