section {
    margin-top: 100px;
    margin-left: auto;
    margin-right: auto;
    width: 40%;
    padding: 5em;
    border: darkslategrey 2px solid;
    background-color: rgba(255,255,255,0.7);
    min-width: 320px;
    min-height: 400px;
}

.form-control {
    max-width: 100%;
}

body {
    height: 100%;
    width: 100%;
     background: url('redimphoto/Presentation/fondcontact.jpg') no-repeat center;
    background-size: cover;
}


@media all and (max-width: 1024px) {
    section {
        width: 80%;
        padding: 2em;

    }
}


@media all and (max-width: 425px) {
    section {
        width: 100%;
        padding: 1em;

    }

}