* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
body {
  background-color: #eafbff;
  background-image: linear-gradient(
    to bottom,
    #eafbff 0%,
    #eafbff 50%,
    #5290f9 50%,
    #5290f9 100%
  );
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow: hidden;
}
nav {
  background-color: #fff;
  padding: 20px;
  width: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-radius: 3px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
  transition: width 0.6s linear;
  -webkit-border-radius: 3px;
  -moz-border-radius: 3px;
  -ms-border-radius: 3px;
  -o-border-radius: 3px;
  -webkit-transition: width 0.6s linear;
  -moz-transition: width 0.6s linear;
  -ms-transition: width 0.6s linear;
  -o-transition: width 0.6s linear;
}
nav.active {
  width: 350px;
  transition: width 0.6s linear;
  -webkit-transition: width 0.6s linear;
  -moz-transition: width 0.6s linear;
  -ms-transition: width 0.6s linear;
  -o-transition: width 0.6s linear;
}
nav ul {
  display: flex;
  list-style-type: none;
  width: 0;
  transition: width 0.6s linear;
  -webkit-transition: width 0.6s linear;
  -moz-transition: width 1.6s linear;
  -ms-transition: width 0.6s linear;
  -o-transition: width 0.6s linear;
}
nav.active ul {
  width: 100%;
  transition: width 0.6s linear;
  -webkit-transition: width 0.6s linear;
  -moz-transition: width 0.6s linear;
  -ms-transition: width 0.6s linear;
  -o-transition: width 0.6s linear;
}
nav ul li {
  transform: rotateY(0deg);
  opacity: 0;
  transition: transform 0.6s liner, opacity 0.6s liner;
  -webkit-transform: rotateY(0deg);
  -moz-transform: rotateY(0deg);
  -ms-transform: rotateY(0deg);
  -o-transform: rotateY(0deg);
  -webkit-transition: transform 0.6s liner, opacity 0.6s liner;
  -moz-transition: transform 0.6s liner, opacity 0.6s liner;
  -ms-transition: transform 0.6s liner, opacity 0.6s liner;
  -o-transition: transform 0.6s liner, opacity 0.6s liner;
}
nav.active ul li {
  opacity: 1;
  transform: rotateY(360deg);
  -webkit-transform: rotateY(360deg);
  -moz-transform: rotateY(360deg);
  -ms-transform: rotateY(360deg);
  -o-transform: rotateY(360deg);
}
nav ul a,
.line {
  position: relative;
  color: #000;
  text-decoration: none;
  margin: 0 10px;
}
.icon {
  border: 0;
  cursor: pointer;
  position: relative;
  height: 30px;
  width: 20px;
  margin-right: 20px;
  padding-right: 40px;
}
.icon:focus {
  outline: 0;
}
.icon .line {
  background-color: #5290f9;
  height: 2px;
  width: 20px;
  position: absolute;
  top: 10px;
  left:0;
  transition: transform 0.6s linear;
  -webkit-transition: transform 0.6s linear;
  -moz-transition: transform 0.6s linear;
  -ms-transition: transform 0.6s linear;
  -o-transition: transform 0.6s linear;
}
.icon .line2{
    top: auto;
    bottom: 10px;
}
nav.active .icon .line1{
    transform: rotate(-765deg) translateY(5.5px);
    -webkit-transform: rotate(-765deg) translateY(5.5px);
    -moz-transform: rotate(-765deg) translateY(5.5px);
    -ms-transform: rotate(-765deg) translateY(5.5px);
    -o-transform: rotate(-765deg) translateY(5.5px);
}
nav.active .icon .line2{
    transform: rotate(765deg) translateY(-5.5px);
    -webkit-transform: rotate(765deg) translateY(-5.5px);
    -moz-transform: rotate(765deg) translateY(-5.5px);
    -ms-transform: rotate(765deg) translateY(-5.5px);
    -o-transform: rotate(765deg) translateY(-5.5px);
}