body {
  font-family: Calibri, Arial, sans-serif;
  font-size: 20px;
  background-color: #305e32;
  margin: 0;
  margin-bottom: 50px;
}

header {
  background-color: #4f81bd;
}

a:link {
  text-decoration: none;
}

/* Navigation */
.topnav {
  overflow: hidden;
  width: 95%;
  margin: auto;
  display: flex;
  justify-content: center;
  align-items: center;
}

.topnav a {
  float: left;
  display: block;
  color: white;
  padding: 8px 12px;
  text-decoration: none;
  font-size: 18px;
}

.topnav .icon {
  display: none;
}

.dropdown {
  float: left;
  overflow: hidden;
}

.dropdown .dropbtn {
  background-color: inherit;
  font-family: inherit;
  font-size: 18px;
  border: none;
  outline: none;
  color: white;
  padding: 8px 12px;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #ffffff;
  min-width: 160px;
  z-index: 1;
}

.dropdown-content a {
  float: none;
  color: black;
  border-bottom: 1px solid #dbdbdb;
  padding: 8px 10px;
  text-align: left;
  font-size: 16px;
}

.topnav a:hover,
.dropdown:hover .dropbtn {
  background-color: RGBa(255, 255, 255, 0.15);
}

.dropdown-content a:hover {
  background-color: #f3f2f1;
  color: black;
}

.dropdown:hover .dropdown-content {
  display: block;
}

.active {
  background-color: #17365d;
  color: white;
}

/* Contenu */
.contenu {
  padding-top: 10px;
  text-align: center;
}

.bienvenue h2 {
  color: #00b050;
  font-size: 30px;
  margin: 0;
}

.bienvenue-text {
  width: 50%;
  margin: auto;
  text-align: justify;
  /* font-size: 20px; */
  color: white;
}

/* Footer */
.copyright {
  background: #4f81bd;
  font-size: 12px;
  color: #ffffff;
  text-align: center;
  position: fixed;
  bottom: 0;
  width: 100%;
}

/* Media queries */
@media screen and (max-width: 800px) {
  .topnav {
    display: block;
    justify-content: none;
    align-items: none;
  }
  .topnav a:not(:first-child),
  .dropdown .dropbtn {
    display: none;
  }
  .topnav a.icon {
    float: right;
    display: block;
  }
  .topnav.responsive {
    position: relative;
  }
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
  .topnav.responsive .dropdown {
    float: none;
  }
  .topnav.responsive .dropdown-content {
    position: relative;
  }
  .topnav.responsive .dropdown .dropbtn {
    display: block;
    width: 100%;
    text-align: left;
  }
  .img_michel-ange {
    width: 90%;
  }
  .bienvenue-text {
    font-size: 16px;
    width: 90%;
  }
}