body {
  font-family: Arial, sans-serif;
  background-color: #ffffff;
  color: #000000;
  text-align: center;
  padding: 40px;
}


.tree {
  overflow-x: auto;
  padding-bottom: 20px;
}


.tree ul {
  padding-top: 20px; 
  position: relative;
  display: flex;
  justify-content: center;
  padding-left: 0;
  min-width: max-content; 
}

.tree li {
  text-align: center;
  list-style-type: none;
  position: relative;
  padding: 20px 5px 0 5px;
}


.tree li::before, .tree li::after {
  content: '';
  position: absolute; 
  top: 0; 
  right: 50%;
  border-top: 2px solid #000;
  width: 50%; 
  height: 20px;
}

.tree li::after {
  right: auto; 
  left: 50%;
  border-left: 2px solid #000;
}


.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:first-child::after {
  border-radius: 5px 0 0 0;
}

.tree li:last-child::before {
  border-right: 2px solid #000;
  border-radius: 0 5px 0 0;
}


.tree ul ul::before {
  content: '';
  position: absolute; 
  top: 0; 
  left: 50%;
  border-left: 2px solid #000;
  width: 0; 
  height: 20px;
}


.tree li span {
  border: 2px solid #000;
  padding: 10px 20px;
  color: #000;
  font-family: Arial, sans-serif;
  font-size: 14px;
  display: inline-block;
  background-color: #fff;
  position: relative;
  z-index: 1;
}