* {margin: 0;padding: 0;}

/* Page de bienvenu */
.container {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    scroll-behavior: smooth;
    font-family:'Helvetica Neue', sans-serif;
}

h1 a {font-size: 80px;color: #FF0000;text-decoration: none;text-transform: uppercase;}

.popover {display: none;box-shadow: 0px 6px 8px rgba(19, 19, 19, .7);}
.popover:target {
  position: absolute;
  right: 0;
  top: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Page de contenu */
.popover .content {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  width: 0;
  height: 0;
  color: #F5F5F5;
  background-color: #008080;
  animation: 1s grow ease forwards;
  text-align: center;
}
/* Texte du contenu */
.nav_list  {list-style-type: none;}
.nav_list a {text-decoration: none;font-size: 50px;color: #000;}
.nav_list_item {height: 100%;overflow: hidden;}
.nav_list li {
  padding: 15px 0;
  text-transform: uppercase;
  transform: translateY(200px);
  opacity: 0;
  animation: 2s slideUp ease forwards .5s;
  position: relative;
}

/* Survole Selection */
.nav_list li::before {
  content: '';
  position: absolute;
  height: 2px;
  width: 0px;
  left: 0;
  bottom: 10px;
  background: #00ffff; 
  transition: all 1.5s ease;
}
/* depart du survole */
.nav_list li:hover:before {width: 100%;}
.popover p {
  padding: 50px;
  opacity: 0;
  animation: .5s fadeIn ease forwards 1s;
}

/* Zone de fermeture */
.popover .close::after {
  right: 0;
  top: 0;
  width: 50px;
  height: 50px;
  position: absolute;
  display: flex;
  z-index: 1;
  font-size: 30px;
  align-items: center;
  justify-content: center;
  background-color: #FF0000;
  color: #fff;
  content: "X";
  cursor: pointer;
  opacity: 0; 
  animation: 1s fadeIn ease forwards .5s;
}
@keyframes grow {100% {height: 90%;width: 90%;}}
@keyframes fadeIn {100% {opacity: 1;}}
@keyframes slideUp {100% {transform: translateY(0);opacity: 1;}}