* {
  font-family: titillium;
  font-size: 12pt;
  list-style-type: none;
}

body {
  margin: 0;
  background-color: #c5c5c5;
  background-size: cover;
  min-height: 800px;
}

nav {
  display: block;
  left: 0;
  right: 0;
  transform: translate(-1000px, 0);
  transition: all 0.5s ease;
}

nav ul {
  display: block;
  float: left;
  width: 100%;
  margin: 0;
  padding: 0;
  list-style-type: none;

}

nav>ul>li {
  position: relative;
  height: 100%;
  flex: 1;
}
nav li>a {
  display: block;
  background-color: rgba(0, 0, 0, 0.2);
  text-align: center;
  box-sizing: border-box;
  top: 50%;
  left: 50%;
  padding: 20px;
  color: #fff;
  margin: 1px;
  text-decoration: none;
  transform: all 0.3s ease;
}
li a {
  text-decoration: none;
  color: black;
}
nav li>a:hover {
  background-color: rgba(255, 255, 255, 0.4);
  color: #000;
  transform: all 0.3s ease;
}

#menu a.dropdown-arrow:after {
  content: "\25BE";
  font-size: 15px;
  margin-left: 5px;
  display: inline-block;
}

.submenus {
  height: auto;
  overflow: hidden;
  width: 170px;
  text-align: left;
  background: #444444;
  border-radius: 2px;
  max-height: 0;
  position: absolute;
  z-index: 99;
  display: none;
}
.submenus > li > a{
  height: 50px;
  padding-left: 20px;
  width: 100%;
  align-items: center;
}
.submenus > li:hover{
  background-color: rgba(33, 105, 236, 0.3);
}
.submenus > li:hover > a{
  color: white;
}
@keyframes rotationFleche{
  0%{
    transform: rotate(0deg);
  }
  100%{
    transform: rotate(90deg);
  }
}
/*la flêche reste à son état*/
.dropdown-menu:hover > a:: after{
  animation: rotationFlache 0.2s linear forwards;
}
@keyframes apparitionSousMenu{
  0%{
    box-shadow: 0px 3px 3px 1px rgb(0, 0, 0);
    border-top: 3px solid #2169ec;
  }
  30%{
    box-shadow: 0px 3px 3px 1px rgba(0, 0, 0, 0.3);
  }
  100%{
    max-height: 50em;
  border-top: 3px solid #2169ec;
box-shadow: 0px 3px 3px 1px rgba(0, 0, 0, 0.3);
  }
}
.dropdown-menu:hover > .submenus{
  animation: apparitionSousMenu 1s forwards;
  display: block;
  width: 100%;
}
.submenus li {
  display: block;
  width: 100%;
}

.submenus a {
  color: #FFFFFF;
  font-size: 16px;
}

li:hover ul.submenus {
  display: block
}

#ch {
  display: none;
}

ul.submenus a:hover {
  background: #F2F2F2;
  color: #444444;
}

#ch:checked+nav {
  transform: translate(0, 0);
  transition: all 0.5s ease;
}

#lab {
  width: 30px;
  height: 30px;
  background: linear-gradient(#fff 0%, #fff 20%, transparent 21%, transparent 40%, #fff 41%, #fff 60%, transparent 61%, transparent 80%, #fff 81%, #fff 100%);
  margin: 4px;
  display: block;
}

@media screen and (min-width:960px) {

  nav {
    display: flex;
    position: absolute;
    width: 100%;
    transform: translate(0px, 0);
  }

  nav ul {
    display: flex;
    width: 250px;
  }

  nav li>a {
    width: 250px;
  }

  #lab {
    display: none;
  }
}