html {
  min-height: 100%;
  background: #E1E1E1;
}

body {
  margin: 10%;
  margin-top: 3%;
  margin-bottom: 3%;
  font-family: math;
  background: #F6F6F6;
  box-shadow: 1px 1px 10px #BBB;
  padding-right: 1.5%;
  padding-left: 1.5%;
}

header {
  background-color: #F6F6F6;
  padding-top: 9%;
  padding-bottom: 5%;
  padding-left: 2%;
}

footer {
  font-size: 0.8em;
  color: #888;
  padding-bottom: 0.01em;
  background: #F6F6F6;
  padding-left: 1.5%;
}

h1 {
  font-family: math;
  font-weight: normal;
  color: #282828;
  text-align: right;
  font-size: 1.75em;
  margin: 0%;
  padding-right: 0.3em;
  padding-bottom: 0.3em;
}

h4 {
  text-align: left;
}

h5 {
  text-align: center;
  font-size: 1.1em;
  font-weight: bold;
  margin-top: 0%;
  margin-bottom: 1%;
}

h6 {
  text-align: right;
  font-size: 0.8em;
  font-style: italic;
  margin-top: 0%;
  margin-bottom: 3%;
}

footer>p {
  margin-bottom: 2%;
}

p {
  margin-bottom: 7%;
}

fieldset {
  margin: 2%;
}

textarea {
  width: 99%;
  height: 95%;
}

a:visited {
  color: rgb(0, 0, 238);
}



/*Menu*/
nav>ul {
  padding: 0px;
}

nav a {
  display: inline-block;
  text-decoration: none;
  color: #202020;
}

nav a:visited {
  color: #202020;
}

nav a:hover {
  color: #006797;
  box-shadow: 1px 1px 1px #BBB;
}

nav>ul>li {
  float: left;
  position: relative;
  margin: 0.2em 0em;
  padding: 0.25em 0.688em;
  color: #202020;
}

nav li {
  list-style-type: none;
}

.menu {
  display: flex;
  min-width: 80%;
  height: auto;
  border-top: 1px solid rgb(200, 200, 200);
  border-bottom: 1px solid rgb(200, 200, 200);
}

.submenu {
  display: none;
}

nav li:hover .submenu {
  display: block;
  position: absolute;
  top: 100%;
  left: 0px;
  padding: 0px;
  z-index: 10000;
}

.submenu li {
  background-color: #F6F6F6;
}

.submenu li a {
  padding: 0.938em 1.875em;
  width: 16.875em;
  font-size: 0.8em;
}

.menu-cell {
  display: inline;
  margin: 3% 1%;
  font: 1.1em math;
  text-align: center;
  text-transform: uppercase;
  flex: 1;
}



/* Texte */
.text {
  display: block;
  padding: 2.625em 0.75em 3.625em 0.75em;
  color: #555;
  text-align: justify;
  text-decoration: none;
  line-height: 1.375em;
  font-size: 1em;
  flex: 1;
  position: relative;
}

.italic {
  font-style: italic;
}

.bleu {
  color: rgb(16, 52, 166);
  font-weight: bold;
}

.announce {
  background-color: lemonchiffon;
  text-align: center;
  padding-top: 0.5em;
  padding-bottom: 0.5em;
}

/* Images */
.img-announce {
  float: center;
  padding-top: 0.5em;
  padding-left: 1em;
  width: 20%;
  height: auto;
}

.logo {
  text-align: left;
  float: left;
  width: 35%;
  max-width: 333.2px;
  height: auto;
}

.portrait {
  float: right;
  padding-left: 1em;
  width: 35%;
  max-width: 333.2px;
  height: auto;
}

.plaque {
  float: right;
  padding-left: 1em;
  margin-right: 30%;
  width: 10%;
  min-width: 5%;
  height: auto;
}

.plaque:hover {
  width: 30%;
  height: auto;
  position: absolute;
  cursor: none;
  margin-right: 13%;
  margin-left: 57%;
  margin-bottom: 20%;
  padding-bottom: 30%;
}

.schema {
  float: right;
  padding-top: 0.5em;
  padding-left: 1em;
  width: 20%;
  max-width: 190px;
  height: auto;
}

.book {
  float: right;
  padding-top: 0.5em;
  padding-left: 1em;
  width: 20%;
  height: auto;
}

.mach_number {
  width: 90%;
  max-width: 856.8px;
  height: auto;
  margin-left: 5.5%;
  margin-right: 4.5%;
}

.fan {
  width: 38%;
  max-width: 361.76px;
  padding-left: 1em;
  height: auto;
  margin-left: 31%;
  margin-right: 31%;
}

.onera1 {
  width: 43%;
  max-width: 409px;
  padding-left: 1em;
  height: auto;
  float: right;
}

.onera2 {
  width: 25%;
  max-width: 238px;
  padding-left: 1em;
  height: auto;
  float: right;
}