:root {
  --lacouleur: brown;
  --sousmenu: #220000;
  --fond-start: #3c3;
  --fond-end: #cc0;
}

#test1 {
  color: var(--lacouleur);
}

body, html {
  height: 100%;
  margin: 0;
  padding: 0;
  background-image: linear-gradient(to right, var(--fond-start) 0%, var(--fond-end) 100%);
}

body {
  display: flex;
  flex-direction: column;
}

/* Liens HTTP */
a[href*="http"] {
  color: blue;
  font-weight: bold;
  text-decoration: underline;
}

/* Liens internes dans le corps */
body > a:link {
  color: red;
  text-decoration: none;
}
body > a:visited {
  color: red;
}
body > a:hover {
  color: red;
  text-decoration: none;
}
body > a:active,
body > a:focus {
  color: red;
}

/* Menu */
#haut, #milieu {
  position: sticky;
  top: 0;
  font-size: small;
  vertical-align: text-top;
  font-weight: bold;
}
#haut {
  color: white;
}
#milieu {
  color: red;
}

nav {
  width: 100%;
  background-color: #A0A0A0;
}

nav > ul {
  margin: 0;
  padding: 0;
}
nav > ul::after {
  content: "";
  display: block;
  clear: both;
}
nav > ul > li {
  float: left;
  position: relative;
}
nav > ul > li a {
  padding: 10px 35px;
  color: #FFF;
}
nav > ul > li:hover a {
  padding: 7px 35px 10px 35px;
}
.menu:hover {
  border-top: 3px solid #ffffff;
  background-color: rgba(255, 255, 0, 0.15);
}

/* Sous-menus */
.submenu {
  display: none;
  background-color: gray;
}
.submenu li {
  border-bottom: 1px solid #CCC;
}
.submenu li a {
  padding: 50px 50px;
  font-size: 15px;
  width: 180px;
  color: var(--sousmenu);
}
.submenu li:hover a {
  color: #EEE;
  font-weight: bold;
}

/* Lien général */
nav a {
  display: inline-block;
  text-decoration: none;
}

/* Heure à droite */
nav > div {
  position: absolute;
  top: 10px;
  right: 10px;
  text-align: right;
  color: white;
  font-weight: bold;
}