body {
    width: 800px;
    margin: 0 auto;
    padding: 20px;
    font-family: Arial, sans-serif;
}
header img {
    width: 250px;
}

form {
    margin: 0 auto;
    font-size: 14px;
    line-height: 2em;

}

#resultat {
    font-size: 16px;
    font-family: Arial, sans-serif;
    padding: 20px;
}

#resultat p {
    margin: 0;
    line-height: 1.4em;
}

footer {
    text-align: center;
    border-top: 1px solid #999;
    padding-top: 20px;
    font-size: 14px;
    padding-bottom: 50px;
}

A {
    color: #0060DF;
}

A:hover {
    color: #717E90;
}

input[type="submit"] {
     padding:20px;
     background-color: #0060DF;
     color: white;
     font-size: 20px;
     border: 0;
 }

input[type="submit"]:hover {
    background-color: #003E90;
    cursor: pointer;
    color: #9BB9E8;
}

input[type="radio"] {
    border: 2px solid #003E90;
    appearance: none;
    width: 20px;
    height: 20px;
    outline:none;
    border-radius: 30%;
}

input[type="radio"]:checked {
    border-color: #06c;
    background-color: #06c;
    box-shadow: inset 0 0 0 3px white;
}

.radio-group {
    display: inline-block;
    white-space: nowrap;
    margin-right: 15px;
    margin-bottom: 5px;
}

fieldset {
    border-radius: 20px;
    padding: 20px;
}

legend {
    font-weight: bold;
    letter-spacing: 2px;
}

@media screen and (max-width: 800px) {
    body,
    #formulaire {
        width: 95%;
        padding: 0;
        margin:0;
        box-sizing: content-box;
    }

    fieldset, form {
        margin: 0 auto;
        width: 95%;
    }

    .radio-group {
        display: block;
    }
}