.side-nav {
  position: relative;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  width: 100px;
  height: 70%;
  max-height: 750px;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  -ms-flex-direction: column;
  flex-direction: column;
  -webkit-justify-content: space-around;
  -ms-flex-pack: distribute;
  justify-content: space-around;
  margin: 0;
  padding: 0;
  list-style-position: inside;
  z-index: 10;
}

.side-nav>li {
  position: relative;
  top: -5px;
  color: #fff;
  font-size: 6px;
  cursor: pointer;
}

.side-nav>li span {
  position: relative;
  top: 3px;
  left: 10px;
  color: #fff;
  font-size: 14px;
  font-weight: 300;
  opacity: 0;
  visibility: hidden;
}

.side-nav>li::before {
  position: absolute;
  top: 3px;
  left: 10px;
  color: #203A59;
  font-size: 14px;
  font-weight: 300;
}

.side-nav li:nth-child(1)::before {
  content: "01";
}

.side-nav li:nth-child(2)::before {
  content: "02";
}

.side-nav li:nth-child(3)::before {
  content: "03";
}

.side-nav li:nth-child(4)::before {
  content: "04";
}

.side-nav li:nth-child(5)::before {
  content: "05";
}
.side-nav li:nth-child(6)::before {
  content: "06";
}
.side-nav li:nth-child(7)::before {
  content: "07";
}
.side-nav li:nth-child(8)::before {
  content: "08";
}
.side-nav li:nth-child(9)::before {
  content: "09";
}
.side-nav li.is-active {
  color: #0f33ff;
  -webkit-transition: color .4s ease-in-out;
  transition: color .4s ease-in-out;
}

.side-nav li.is-active span {
  opacity: 1;
  visibility: visible;
  -webkit-transition: opacity .4s ease-in-out;
  transition: opacity .4s ease-in-out;
}

.side-nav li.is-active::before {
  left: -33px;
  color: #fff;
}