* {
  margin: 0;
  padding: 0;
}
.tree {
  width: 900px;
  margin: 50px auto;
}
.tree ul {
  padding-top: 20px;
  position: relative;
  transition: all 0.5s;
}
.tree li {
  float: left;
  text-align: center;
  list-style-type: none;
  position: relative;
  padding: 20px 5px 0 5px;
  transition: all 0.5s;
}
.tree li::before,
.tree li::after {
  content: "";
  position: absolute;
  top: 0;
  right: 50%;
  border-top: 1px solid #ccc;
  width: 50%;
  height: 20px;
}
.tree li::after {
  right: auto;
  left: 50%;
  border-left: 1px solid #ccc;
}
.tree li:only-child::after,
.tree li:only-child::before {
  display: none;
}
.tree li:only-child {
  padding-top: 0;
}
.tree li:first-child::before,
.tree li:last-child::after {
  border: 0 none;
}
.tree li:last-child::before {
  border-right: 1px solid #ccc;
  border-radius: 0 5px 0 0;
}
.tree li:first-child::after {
  border-radius: 5px 0 0 0;
}
.tree ul ul::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  border-left: 1px solid #ccc;
  width: 0;
  height: 20px;
}
.tree li a {
  border: 1px solid #ccc;
  padding: 5px 10px;
  text-decoration: none;
  color: #666;
  font-family: arial, verdana, tahoma;
  font-size: 11px;
  display: inline-block;
  border-radius: 5px;
  transition: all 0.5s;
}
.tree li a:hover,
.tree li a:hover + ul li a {
  background: #c8e4f8;
  color: #000;
  border: 1px solid #94a0b4;
}
.tree li a:hover + ul li::after,
.tree li a:hover + ul li::before,
.tree li a:hover + ul::before,
.tree li a:hover + ul ul::before {
  border-color: #94a0b4;
}

.tree li.only-visible::after,
.tree li.only-visible::before {
  display: none; /* Remove the unwanted connector lines */
}

.tree li {
  position: relative;
}

.tree li a {
  position: relative;
  z-index: 1; /* Ensure links are above any pseudo-elements */
}
.action-menu {
  margin-left: 10px;
  display: inline-block;
}

.action-menu button {
  margin-right: 5px;
  padding: 5px 10px;
  font-size: 12px;
  cursor: pointer;
}