/* default */
body{
  padding: 0;
  margin: 0;
  overflow-x: hidden;
  font-family: 'Roboto', sans-serif;
}

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

img {
  vertical-align: bottom;
}

/* nav */
.menu {
  overflow: hidden;
	width: 800px;
	position: fixed;
  z-index: 5;
  left: 100px;
  top: 10px;
  background-color: gray;
  text-align: center;
  margin: 0;
  padding: 10px;
  display: table;
  border-radius: 5px;
}

.menu li{
  list-style: none;
  display: table-cell;
}

.menu li a {
  text-decoration: none;
  color: #fff;
}

/* download */
.download {
  z-index: 5;
  position: fixed;
  left: 950px;
  top: 10px;
  width: 130px;
  background-color: purple;
  padding: 10px;
  text-align: center;
  border-radius: 5px;
}

.download a {
  color: #fff;
}

/* scroll */
.scroll {
  position: fixed;
  bottom: 0;
  left: 0;
}

.back{
  z-index: 1;
  height: 100%;
  width: 40000px;
}

.back img {
  width: 40000px;
}

.middle{
  z-index: 2;
  height: 110%;
  width: 13000px;
}

.front{
  z-index: 3;
  width: 10000px;
}

/* slides */
.slides {
  z-index: 4;
  height: 100%;
  display: flex;
}

.titlepage, .examples, .introduction, .instruction, .useful, .function {
  display: flex;
}

.example {
  margin: auto;
  height: 75%;
  max-height: 500px;
  width: 800px;
  background-color: #fff;
  margin-left: 100px;
}

.example h2, .example h3 {
  padding: 20px;
  margin: 0;
}

.example h2{
  font-size: 2em;
  padding-top: 50px;
}

.example h3 {
  font-size: 1.5em;
}

.example table {
  margin: auto;
  width: 70%;
  font-size: 1.2em;
}

table th{
  padding: 10px;
  font-size: 1.4em;
}

.slides img {
  margin: auto;
  height: 75%;
  margin-left: 100px;
  max-height: 500px;
  object-fit: contain;
}


/* animals */
.bird {
  position: absolute;
  z-index: 3;
}

.bird img, .rabbit img, .bear img, .fox img, .owl img {
  width: 150px;
}

.fox {
  z-index: 5;
  bottom: 40px;
  animation: moving 2s infinite;
}

@keyframes moving{
  0%{
    transform: translate(0, 0px);
  }
  25%{
    transform: translate(0, 30px);
  }
  25%{
    transform: translate(0, 30px);
  }
  100%{
    transform: translate(0, 0);
  }
}

.bear {
  z-index: 3;
  position: fixed;
  left: 250px;
  bottom: 75px;
}

.owl {
  z-index: 5;
  position: fixed;
  right: 100px;
}

.rabbit {
  position: absolute;
  z-index: 3;
  left: 1000px;
  bottom: -50px;
}