body {
    height: 100%;
    background: rgb(213, 224, 247);
    font-size: 16px;
  }
body {
    display: flex;
    flex-wrap: wrap;
    margin: 0;
  }

.header-menu,  footer {
    display: flex;
    align-items: center;
    width: 100%;
  }  

  h2 {
    margin: 0 0 8px;
  }
  ul li {
    display: inline-block;
    padding: 7px;
    list-style: none;
    border : 1px solid #1c87c9
  }

  ul li:hover {
    display: inline-block;
    list-style: none;
    background: #1565C0;
    padding: 7px;
    border : 1px solid #000000;
    border-radius: 11px;
  }

  .header-menu {
    justify-content: flex-end;
    height: 60px;
    background: #1c87c9;
    color: #fff;
  }
  section {
    flex: 1;
    padding-right: 15px;
    padding-left: 15px;
    max-width : 640px;
  }
  aside {
    flex: 0.4;
    height: 800px;
    padding-left: 15px;
    border-left: 1px solid #666;
  }

iframe {
  border-width: 10px;
  border : 0; 
  width: 500px;
  height: 400px;
}

footer{
  display: flex;
  flex-direction: row;
  justify-content: space-around;
  background-color: rgb(189, 189, 190);
  font-size: 12px;
}

footer small {
  color: rgb(0, 0, 0);
}

a { text-decoration:none; }
a:link {color:#000000;}              /* Lien non visité */
a:visited {color:#000000;}          /* Lien visité */
a:hover {color:#0000FF;}            /* Lien survolé*/