* {margin: 0; padding: 0;}
.tree{overflow: auto;}
.tree ul {
    padding-top: 20px; position: relative;

    transition: all 0.5s;
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    display: flex;
    justify-content: center;
}

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

    transition: all 0.5s;
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
}

/*We will use ::before and ::after to draw the connectors*/

.tree li::before, .tree li::after{
    content: '';
    position: absolute; top: 0; right: 50%;
    border-top: 1px solid #ccc;
    width: 50%; height: 20px;
}

/*We need to remove left-right connectors from elements without 
any siblings*/
.tree li:only-child::after, .tree li:only-child::before {
    display: none;
}

/*Remove space from the top of single children*/
.tree li:only-child{ padding-top: 0;}


/*Time to add downward connectors from parents*/
.tree ul ul::before{
    content: '';
    position: absolute; top: 0;
    border-left: 1px solid #ccc;
    width: 0; height: 20px;
    left: 50%;
}

.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;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;

    transition: all 0.5s;
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    line-height: 16px;
}

/*Time for some hover effects*/
/*We will apply the hover effect the the lineage of the element also*/
.tree li a:hover, .tree li a:hover+ul li a {
    background: #c8e4f8; color: #000; border: 1px solid #94a0b4;
}
/*Connector styles on hover*/
.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 ul ul ul ul li a {
    position: relative;
    left: 50%;
    transform: translateX(-50%);
    padding: 5px 10px;
    text-decoration: none;
    color: #666;
    font-family: arial, verdana, tahoma;
    font-size: 11px;
    border: 1px solid #ccc;
    border-radius: 5px;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    transition: all 0.5s;
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    text-orientation: mixed !important;
    white-space: nowrap; /* Prevent text from wrapping */
    
    writing-mode: vertical-rl; /* Vertical orientation */
}



.tree li::after{
    right: auto; left: 50%;
    border-left: 1px solid #ccc;
}
.tree ul ul ul::before {
    content: '';
    position: absolute; left: 50%; bottom: -20px;
    border-left: 1px solid #ccc;
    height: 20px;
}
/*Remove left connector from first child and 
  right connector from last child*/
.tree li:first-child::before, .tree li:last-child::after{
    border: 0 none;
}
/*Adding back the vertical connector to the last nodes*/
.tree li:last-child::before{
    border-right: 1px solid #ccc;
    border-radius: 0 5px 0 0;
    -webkit-border-radius: 0 5px 0 0;
    -moz-border-radius: 0 5px 0 0;
}
.tree li:first-child::after{
    border-radius: 5px 0 0 0;
    -webkit-border-radius: 5px 0 0 0;
    -moz-border-radius: 5px 0 0 0;
}


@media (max-width: 600px) {
    .tree ul ul ul ul li a {
        writing-mode: horizontal-tb;
    }

    .tree ul ul ul {
        padding-top : 0;
    }

    .tree > ul > li > ul > li > ul > li {
        padding: 0 0 0 20px;
        display: flex;
        align-items: center;
        clear: left;
        position: relative;
        left: 50%;
    }
    .tree > ul > li > ul > li > ul > li::before {
        height: 100%;
    }
    .tree > ul > li > ul > li > ul > li:last-child::before {
        height: 50%;
    }

    .tree > ul > li > ul > li > ul > li > a {
        writing-mode: vertical-rl;
    }


    .tree ul ul ul li::before {
        width: 20px;
        left: 0;
        border-left: 1px solid #ccc !important;
        border-top: none;
    }
    .tree ul ul ul li:last-child::before {
        border-bottom: 1px solid #ccc;
        border-right: none;
        border-radius: 0 0 0 5px;
        -webkit-border-radius: 0 0 0 5px;
        -moz-border-radius: 0 0 0 5px;
    }
    .tree ul ul ul li::after {
        width: 20px;
        top: 50%;
        left: 0;
        border-left: 1px solid #ccc;
        
        border-radius: 0 !important;
        -webkit-border-radius: 0 !important;
        -moz-border-radius: 0 !important;
    }

    .tree ul ul ul ul {
        display: inline-block;
        padding: 0 0 0 20px;
    }

    .tree ul ul ul ul::before {
        border-left: none;
        border-top: 1px solid #ccc;
        width: 20px;
        left: 0;
        top: 50%;
    }

    .tree ul ul ul ul li {
        float: none;
        padding: 5px 0 5px 20px;
    }

    .tree ul ul ul ul li:first-child::before,
    .tree ul ul ul li:last-child::after {
        border: 0 none !important;
    }
    .tree ul ul ul ul li:first-child::after{
        border-radius: 5px 0 0 0 !important;
        -webkit-border-radius: 5px 0 0 0 !important;
        -moz-border-radius: 5px 0 0 0 !important;
    }
}