.menu-item {
  height: 45px;
  display: flex;
  cursor: pointer;
  border-radius: 5px;
  margin: 5px 0px;
  color: #afb2ba;
}
.menu-item:hover,
.menu-item.matched {
  background-color: rgba(255, 255, 255, 0.05);
  color: #ffffff;
}
.menu-item.open > div:nth-of-type(4) > i {
  transform: rotateZ(-180deg);
}
.menu-item > div:nth-of-type(1) {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-basis: 45px;
}
.menu-item > div:nth-of-type(2) {
  display: flex;
  align-items: center;
  flex: 1;
}
.menu-item > div:nth-of-type(3) {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-basis: 30px;
}
.menu-item > div:nth-of-type(4) {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-basis: 30px;
}
.menu-item > div:nth-of-type(4) > i {
  transition-duration: 0.5s;
}
.sub-menu {
  overflow: hidden;
  transition-duration: 0.5s;
}