layout.css

/* modification for prism.css */
code[class*="language-"], pre[class*="language-"] {
  tab-size: 0;
}
/* end modification prism.css */

/* Loader */
  #load {
    display: none;
    width: 100%;
    height: 100%;
    position: fixed;
    z-index: 100000;
    background: white;
    text-align: center;
    opacity: 0;
    transition: opacity 0.2s linear;
  }
  #load img {
    width: 100px;
    height: auto;
    margin-top: 40vh;
  }
/* End Loader */

/* Popup */
  #popup {
    position: fixed;
    width: 100%;
    height: 100%;
    z-index: 50;
    background: rgba(0,0,0,0.50);
    opacity: 0;
      -webkit-filter: blur(50px);
      transition: opacity 0.3s ease-in-out, -webkit-filter 0.3s ease-in-out;
  }

  #popup #content {
    position: absolute;
    top: 0;
    left: 0;
    background-color: white;
    width: 100%;
    height: 100%;
    transform-origin: 50% 50%;
    overflow-y: auto;
    border-radius: 5px;
  }
  #popup #content > button {
    position: absolute;
      background: none;
      border: none;
      float: right;
      color: red;
      cursor: hand;
      border: 1px solid red;
      padding: 5px 7px;
      border-radius: 20px;
      top: 10px;
      right: 10px;
      transition: all 0.2s ease-in-out;
  }
  body {
    margin: 0;
    padding: 0;
  }
  a {
    text-decoration: none;
    color: #071E3D;
  }

  .topbar {
    margin: auto;
    width: 80%;
    text-align: center;
    height: 100px;
    background-color: inherit;
    position: relative;
  }
  .menutopbar,.gitbuttondiv{
    display: inline-block;

   }
   .gitbuttondiv  {
     text-align: right;
     width: 20%;
     padding: 20px;
   }
  .menutopbar  li{
    font-family: Helvetica;
    position: relative;
    display: inline-block;
    margin-left: 5vh;
  }
  .listbarli:before{
      content: "";
      position: absolute;
      width: 50%;
      height: 2px;
      top: 70%;
      right: 25%;
      background-color: darkcyan;
      visibility: hidden;
      -webkit-transform: scaleX(0);
      transform: scaleX(0);
      -webkit-transition: all 0.3s ease-in-out 0s;
      transition: all 0.3s ease-in-out 0s;
  }
  .listbarli:hover:before {
      visibility: visible;
      -webkit-transform: scaleX(1);
      transform: scaleX(1);
  }

  .githubbutton {
    padding: 10px;
    right: 0;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    background-color: transparent;
    text-decoration: none;
    border: 2px solid;
    font-size: 16px;
    text-rendering: optimizeLegibility;
    font-weight: bold;
  }
  .githubbutton:hover {
    transform: scale(1.05);
  }

  #popup #content > button:hover {
    color: white;
    background: red;
  }
  #popup #content #title {
    text-align: center;
    margin: 40px 0px;
    display: block;
  }
  #popup #content #text {
    margin-left: 10vw;
    display: block;
    vertical-align:top;
  }
  #popup #content .afaire {
    border: 1px solid black;
    border-radius: 5px;
    position: relative;
    display: block;
    max-width: 500px;
    margin: auto;
    margin-bottom: 25px;
    text-align: center;
  }
  #popup #content .afaire::before {
    content: "A reproduire";
    background-color: white;
    padding: 5px 10px;
    position: absolute;
    top: -15px;
    left: 25px;
  }
  #popup #content .btn-choice-lng {
    margin-left: 40px;
    display: none;
  }
  #popup #content .btn-choice-lng button {
    width: auto;
    height: 30px;
    border: none;
    border-radius: 3px;
    margin-bottom: -3px;
    padding: 5px 10px;
    cursor: hand;
    width: auto;
    background: #8B8E7A;
    color: white;
  }

  #popup #content .btn-choice-lng .active {
    background: #272822;
    color: white;
  }

  .exercice span[class="lg"] {
    background: #272822;
    color: white;
    float: left;
    height: 30px;
    border: none;
    border-radius: 3px;
    margin-bottom: -3px;
    margin-left: 47px;
    padding: 5px 10px;
    cursor: hand;
  }

  .exercice .col-6 {width: 49.8%;}

  .exercice form {
      width: 100%;
  }
  .exercice form #html, .exercice form #css {
    display: inline-block;
  }
  .exercice p {
    font-size: 13px;
    text-align: center;
    visibility: hidden;
  }

  .exercice section {
    width: 100%;
  }
  .exercice .resultat {
    display: inline-block;
    vertical-align: top;
    position: relative;
  }

  .sm {display: none;}

  @media (max-width: 992px) {
    #popup #content .btn-choice-lng {display: inline-block;}
    .lg {display: none;}
    .exercice .col-6 {width: 100%;}
    .exercice form #html {
      display: none;
    }
    .exercice form #css {
      display: block;
    }
    section h2 {
      font-size: 1.2em;
    }
    section .text {
      font-size: 1em;
    }
  }


  @media (max-width: 533px) {
    section .text, section .exemple {
      padding-left: 25px;
      display: block;
      width: 100%;
      text-align: center;
    }
  }
/* End Popup */

/* Frame */
  #frame {
    position: absolute;
    z-index: 25;
    background-color: white;
    width: 100%;
    height: auto;
    top: 0px;
    left: 0px;
    opacity: 1;
    transition: all 0.5s linear;
  }
/* End frame */

/* Contenu */
  #contenu {
    text-align: center;
  }
/* End Contenu */


::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}
::-webkit-scrollbar-button {
  width: 0px;
  height: 0px;
}
::-webkit-scrollbar-thumb {
  background: #93B7EF;
  border: 0px none #ffffff;
  border-radius: 50px;
}
::-webkit-scrollbar-thumb:hover {
  background: #4984E6;
}
::-webkit-scrollbar-thumb:active {
  background: #4984E6;
}
::-webkit-scrollbar-track {
  background: #666666;
  border: 0px none #ffffff;
  border-radius: 100px;
}

::-webkit-scrollbar-corner {
  background: transparent;
}

* {
	box-sizing: border-box;
  		-webkit-box-sizing: border-box;
    		-moz-box-sizing: border-box;
  	text-rendering: optimizeLegibility;
  		-webkit-font-smoothing: antialiased;
  			-moz-osx-font-smoothing: grayscale;
}
img {
    image-rendering: optimizeSpeed;             /* STOP SMOOTHING, GIVE ME SPEED  */
    image-rendering: -moz-crisp-edges;          /* Firefox                        */
    image-rendering: -o-crisp-edges;            /* Opera                          */
    image-rendering: -webkit-optimize-contrast; /* Chrome (and eventually Safari) */
    image-rendering: pixelated; /* Chrome */
    image-rendering: optimize-contrast;         /* CSS3 Proposed                  */
    -ms-interpolation-mode: nearest-neighbor;   /* IE8+                           */
}
a {color: inherit;}
ul {padding-left: 0;}
body {
	margin: 0;
	padding: 0;
	position: relative;
	font-family: 'Lato', sans-serif;
	width: 100%;
  overflow-x: hidden;
}

header {
	width: 100%;
	position: relative;
  background-color: white;
	z-index: 10;
  overflow: hidden;
}
.logo {
    position: relative;
    margin:auto;
    text-align: center;
    margin-top: 3em;
  }
  @keyframes circle {
      from
      {
        transform:translate(10vw,-20vh);
        opacity: 1
      }
      to
      {
        transform:translate(0,0);
        opacity: 1;
      }
  }

  .lune {
    animation-name: circle;
    animation-duration: 10s;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
    animation-delay: 2s;
    border-radius: 50%;
    height: 100px;
    margin: 2vh auto;
    width: 100px;
    opacity: 0;
    background-color: lightgrey;
    -webkit-box-shadow: inset -10px 1px 5px 0px #656565;
    -o-box-shadow: inset -10px 1px 5px 0px #656565;
    box-shadow: inset -10px 1px 5px 0px #656565;
    -moz-border-radius: 100px;
    -webkit-border-radius: 100px;
    border-radius: 100px;
    z-index: -1;
    display: flex;
    flex-direction: row;

}


  header .clouds-wrapper {
    position: absolute;
    opacity: .99;
    margin: auto;
    width: 100%;
    z-index: 1; }
    header .clouds-wrapper ul {
      position: relative;
      list-style-type: none; }
      header .clouds-wrapper ul li {
        position: absolute;
        background: lightgrey; }
        header .clouds-wrapper ul li:nth-child(1) {
          border-radius: 30px;
          height: 50px;
          width: 150px; }
        header .clouds-wrapper ul li:nth-child(2) {
          border-radius: 50%;
          height: 80px;
          margin-top: -40px;
          margin-left: 23px;
          width: 80px; }
        header .clouds-wrapper ul li:nth-child(3) {
          border-radius: 50%;
          height: 50px;
          margin-top: -25px;
          margin-left: 80px;
          width: 50px; }
    header .clouds-wrapper .clouds1 {
      animation: slideOver 12s infinite Alternate-reverse both;
      -webkit-animation: slideOver 12s infinite Alternate-reverse both; }
    header .clouds-wrapper .clouds2-container {
      transform: scale(0.75);
      -webkit-transform: scale(0.75); }
    header .clouds-wrapper .clouds2 {
      animation: slideOver 7s .5s infinite Alternate-reverse both;
      -webkit-animation: slideOver 7s .5s infinite Alternate-reverse both; }
    header .clouds-wrapper .clouds3-container {
      transform: scale(0.7);
      -webkit-transform: scale(0.7); }
@keyframes slideOver {
  0% {
    transform: translateX(0%);
    -webkit-transform: translateX(0%);
    opacity: 0; }
  20% {
    opacity: 1; }
  90% {
    opacity: 1; }
  100% {
    transform: translateX(100%);
    -webkit-transform: translateX(100%);
    opacity: 0; } }

.content_mountains  {
  text-align: center;
  /*border:1px solid red;*/
  margin: auto;
  margin-left: 12vw;
  z-index: 12;
}
.content_header {
  width: 100%;
  margin: auto;
}

.mountains {
  margin: auto;
  width: 800px;
  z-index: 13;
}

.mountains li {
  float: left;
  list-style: none;
  z-index: 13;
}
@keyframes transimountains {
 from { transform: translateY(300px);
   visibility: hidden;
 }
 to {
   transform: translateY(0px);
   visibility: visible;
 }
}


.peak1 {
	border-left: 200px solid transparent;
	border-right: 200px solid transparent;
	border-bottom: 200px solid darkcyan;
  animation-name: transimountains;
  animation-duration: 1s;
}

.peak2 {
	border-left: 150px solid transparent;
	border-right: 175px solid transparent;
	border-bottom: 150px solid darkcyan;
  margin-left: -200px;
  margin-top: 50px;
  animation-name: transimountains;
  animation-duration: 2s;
}

.peak3 {
	border-left: 200px solid transparent;
	border-right: 200px solid transparent;
	border-bottom: 200px solid darkcyan;
  margin-left: -250px;
  animation-name: transimountains;
  animation-duration: 2s;
}

.logo img {
    width: 55%;
    height: auto;
}

  #active_menu a {
	display: inline-block;
	width: 45px;
	cursor: pointer;
	padding: 5px;
	transition: all 0.6s ease-in-out;
	vertical-align: sub;
  }

 #active_menu {
   position: fixed;
    padding: 2vw;
		display: inline-block;
    z-index: 27;
  }

 #active_menu span  {
	display: block;
	background: rgb(77, 77, 77);
	width: 100%;
	height: 2px;
	margin: 5px 0px;
  transition: all 0.5s ease-in-out;
}

.menubutton1:hover {
	background-color: rgb(234, 67, 53);
}
.menubutton2:hover {
	background-color: rgb(52, 168, 83);
}
.menubutton3:hover {
	background-color: rgb(66, 66, 66);
}
.menubutton4:hover {
	background-color: rgb(207, 206, 211);
}
.menubutton5:hover {
	background-color: rgb(255, 87, 34);
}
.menubutton6:hover {
	background-color: rgb(103, 58, 183);
}
.menubutton7:hover {
	background-color: rgb(137, 198, 63);
}
.menubutton8:hover {
	background-color: rgb(233, 29, 97);
}

.sidebar {
	z-index: 26;
  width: 100%;
	position: fixed;
  height: 100%;
  margin-left: -100%;
	transition: all 0.2s ease-in-out;
}
.leftbar {
  vertical-align: top;
  width: 100%;
  height: 100%;
  /*display: flex;*/
	background-color: darkcyan;
	z-index: 10;
	position: relative;
}
a {
	 text-decoration: none;
}
.leftbar h3 i {
	margin-right: 10px;
}
.leftbar ul {
  padding-top: 10%;
  text-align: left;
  list-style: none;
  padding-left: 0;
  margin: auto;
  width: 200px;
}
.leftbar ul a {
  float: left;
  width: 100%;
}
.leftbar li {
	color: white;
	transition: all 0.2s ease-in-out;
	position: relative;
	z-index: 1;
}

.leftbar li::before{
  content: "";
  position: absolute;
  width: 75%;
  height: 2px;
  left: -1vw;
  bottom: -2vh;
  background-color: white;
  visibility: hidden;
  -webkit-transform: scaleX(0);
  transform: scaleX(0);
  -webkit-transition: all 0.3s ease-in-out 0s;
  transition: all 0.3s ease-in-out 0s;
	z-index: -1;
}
.leftbar li:hover::before {
    visibility: visible;
    -webkit-transform: scaleX(1);
    transform: scaleX(1);
}

#active_menu ,.sidebar {
  display: none;
}

@media (max-width: 1100px) {
  #active_menu {
    display: inline-block;
  }
  .sidebar {
    display: block;


  }
  .topbar {
    display: none;
  }
	header > a {
		font-size: 1em;
		margin-left: 10px;
	}
	header #active_menu a {
		margin-left: 0px;
	}

}
@media (max-width: 760px) {
  #active_menu {
    padding: 0px;
   }
}