* {
    box-sizing: border-box;
}

main {
    width: 80%;
    min-width: 500px;
    max-width: 10000px;
    text-align: left;
    margin: auto;
}

div#main1 {
    margin: 0 auto;
}

h1 {
    border-color: cornflowerblue;
    border-style: solid;
    text-align: center;
    width: 80%;
    max-width: calc(100% - 40px);
    margin: 50px auto;
}

h1:hover {
    color: white;
    background-color: lightsteelblue;
}

h2 {
    padding-top: 10px;
    border: 2px #838383 solid;
}

h3 {
    text-decoration: underline red;
    margin: 3px;
    padding: 3px;
}

form {
    margin: 0 auto;
    width: 400px;
    padding: 1em;
    border: 1px solid #CCC;
    border-radius: 1em;
}

form {
    margin: 10px;
    background: #ffffff;
    max-width: 350px;
    border-radius: 15px;
    border: 1px solid cornflowerblue;
    padding: 10px;
    width: 80em;
    max-width: 10000px;
    min-width: 1000px;
    margin: 0 auto;
    background-color: #EAECEE;
}

form div + div {
    margin-top: 1em;
}

input {
    font: 1em sans-serif;
    width: 300px;
    box-sizing: border-box;
    border: 1px solid #999;
}

button {
    font-size: 20px;
    display: block;
    margin: 10px auto;
    border-color: cornflowerblue;
}

.preference {
    display: flex;
    justify-content: space-between;
    width: 60%;
    margin: .5rem;
}

div.main ul {
    margin: 0;
    padding: 0;
    list-style-type: none;
}

div.main form {
    border: none;
}

div.infoperso {
    position: relative;
    width: 80%;
    min-width: 500px;
    max-width: 1000px;
    display: grid;
    margin: auto;
}

ul {
    position: relative;
    width: 90%;
    min-width: 300px;
    max-width: 0px;
    display: grid;
    margin: auto;
}

div.main {
    padding-top: 30px;
    margin-left: 13%;
    min-width: 300px;
    max-width: 0px;
}

div.main li {
    border-top: 1px solid #0000CD;
    display: block;
    margin: 30px 0;
    padding: 0;
}

div.main ul li {
    float: left;
    text-align: center;
    position: relative;
    display: block;
}

div.main li ul {
    display: none;
}

div.main ul li > a {
    display: block;
    text-decoration: none;
    color: black;
    border-top: 1px solid #ffffff;
    padding: 5px;
    background: blue;
    margin-left: 1px;
    border-top: 1px solid #ffffff;
    text-align: center;
    margin: 2px;
    border-bottom-right-radius: 40%;
    border: black 10px;
    background-color: lightsteelblue;
    text-transform: uppercase
}

div.main ul li > a:hover {
    border-radius: 0%;
    background-color: cornflowerblue
}

div.main ul > li.entete {
    border: 2px solid cornflowerblue;
    margin-bottom: 3px;
}

nav li:hover li {
    float: none;
    font-size: 11px;
}

.qst > a:hover {
    background-color: darkblue;
    color: white;
    border-radius: 7px
}

div.main li:hover li a:hover {
    background: #4169E1;
}

div.main > ul li:hover .sous {
    cursor: pointer;
    font-size: 17px;
    transform: scale(1);
}

.propriete {
    display: flex;
    justify-content: space-between;
    width: 60%;
    margin: .3rem;
}

div.main ul li > div.qst > a {
    color: black;
    text-decoration: none;
    width: max-content;
    padding: 5px;
}

iframe {
    width="425";
    height="350";
    border: 1px solid black;
}

body {
    font: 0.9em sans-serif;
    color: black;
    background-color: #EAECEE;
}

input:focus {
    background: rgb(221 221 221);
    border-color: #000;
}

#commentaire {
    background-color: cornflowerblue;
    border-radius: 7px;
}

.mainiframe {
    width="425";
    height="350";
    border: 1px solid black;
}

fieldset {
    width: 100%;
    border-width: 0px 0px 1px 0px;
    padding: 10px;
}

fieldset>input {
    display: flex;
    margin: auto;
    width: 500px;
}

input[type=text],
input[type=email],
input[type=number],
input[type=tel],
input[type=url],
input[type=date],
input:invalid {
    background-color: lightsteelblue;
    border: dotted cornflowerblue;
    border-width: 3px;
}

#td4exo {
    background-color: #d3d3d3;
    max-width: fit-content;
}

.entete {
    width: 200%;
    float: left;
}

div>label {
    margin: 5px 0;
    width: 2000%;
}

#main1:last-child {
    display: flex;
}