html, body {
  margin: 0;
  width: 100%;
  height: 100%;
  background: black;
  color: red;
  padding: 0;
}

/* TITRES */
h1 {
  font-family: "Rubik Microbe", Verdana, sans-serif;
  font-size: 100px;
  text-align: center;
  margin-bottom: 40px;
}

h3 {
  color: red;
}

.intro-bruit {
  margin-bottom: 0;
}

.phrase-centre {
  text-align: center;
  margin-bottom: 80px;
}

/* IMAGES */
.center {
  display: block;
margin: 40px auto;  
  width: 1000px;
border: 5px solid red;
}

.nocenter {
  display: block;
margin: 40px auto;  
  width: 1000px;

}
border: 5px solid purple;


/* MICROSCOPE */
.microscope-zone {
  overflow: hidden;
  position: relative;
  margin-top: 60px;
}

.image-gauche {
  float: left;
}

/* IMAGE CLIQUABLE */
.ouille-bas,
#bouton {
  display: block;
  margin: 900px auto 0 auto;
  border-radius: 50%;
  cursor: pointer;
  transition: opacity 0.8s ease;
}

.fade-out {
  opacity: 0;
}

/* MATOS */
.matos {
  display: block;
  margin: 200px auto;
}

/* LISTE */
ol {
  margin-top: 80px;
}

a {
  color: red;
  text-decoration: none;
}

a:hover {
  color: darkred;
  text-decoration: underline;
}

/* VIDEO YOUTUBE PLEIN ÉCRAN */



#video-container {
  position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
  width: 100%;
  height: 100%;
  background-color: black;
}

#player {
  width: 100%;
  height: 100%;
}

#player iframe {
  width: 100%;
  height: 100%;
  border: 0;
}