ul,
#myUL {
    list-style-type: none;
}

#myUL {
    margin: 0;
    padding: 0;
}

.level_item {
    display: flex;
    align-items: center;
    cursor: pointer;
    -webkit-user-select: none;
    /* Safari 3.1+ */
    -moz-user-select: none;
    /* Firefox 2+ */
    -ms-user-select: none;
    /* IE 10+ */
    user-select: none;
}

.level_item::before {
    font-family: bootstrap-icons !important;
    color: #aaa;
    display: inline-block;
    margin-left: 6px;
    margin-right: 6px;
    font-size: 1.2rem;
    font-weight: 700;
    transition: all 0.3s ease-in-out;
}

.with_child::before {
    content: "\f4fd";
}

.without_child::before {
    content: "\f2ea";
}

.with_child-down::before {
    content: "\f2e9";
}

.nested {
    display: none;
}

.active {
    display: block;
}

#myUL li {
  background-color: #fff;
}
#myUL li li {
  background-color: #fcfcfc;
}
#myUL li li li {
  background-color: #f8f8f8;
}
#myUL li li li li{
  background-color: #f2f2f2;
}
#myUL li li li li li{
  background-color: #f6f6f6;
}
#myUL li li li li li li{
  background-color: #f5f5f5;
}