CSS styling of Category/Sub-Category list

Question

.parent {
  position: relative;
}

.parent .parent-header:after {
  content: '';
  position: absolute;
  width: 1px;
  height: 30px;
  left: 15px;
  top: 36px;
  border-left: 1px dotted black;
}

.child {
  padding-left: 30px;
  position: relative;
}

.child .child-header:before {
  content: '';
  position: absolute;
  width: 1px;
  height: 100%;
  left: 15px;
  top: 0px;
  border-left: 1px dotted black;
}

.child:last-child .child-header:before {
  content: none;
}

.child .child-header:after {
  content: '';
  height: 1px;
  width: 15px;
  position: absolute;
  left: 15px;
  top: 15px;
  border-top: 1px dotted black;
}

<div class="parent">
  <h2 class="parent-header">Heading</h2>
  <div class="child">
    <h2 class="child-header">Block 1</h2>
    <div>some text some text some text some text some text some text some text some text some text some text some text some tex</div>
  </div>
  <div class="child">
    <h2 class="child-header">Block 2</h2>
    <div>some text some text some text some text some text some text some text some text some text some text some text some tex</div>
  </div>
  <div class="child">
    <h2 class="child-header">Block 3</h2>
    <div>some text some text some text some text some text some text some text some text some text some text some text some tex</div>
  </div>
</div>

http://plnkr.co/edit/LmA1wsn8pLPwQCtPnqtM?p=preview

please look into the plnkr. i am trying to fill the gap between the vertical lines. can someone help me. I am open to better ways than what i did to achieve that styling

Answer 1

add element default padding and margin 0 in you style.

*{
    margin: 0;
    padding : 0;
  }

when you inspect your code can see default style for the element example h2

 h2 {
display: block;
font-size: 1.5em;
-webkit-margin-before: 0.83em;
-webkit-margin-after: 0.83em;
-webkit-margin-start: 0px;
-webkit-margin-end: 0px;
font-weight: bold;

}

code here : https://jsfiddle.net/okvnxqxo/

Answer 2

http://plnkr.co/edit/H7LTMEBRlOpm89nCMCl6?p=preview

here is the plunker what you need.

.parent .parent-header:after {
  top: 35px;
}

.child-header {
  margin-top:0;
  padding-top:25px;
}

.child:last-child .child-header:before {
  height: 35px;
}

Basically what was causing that gap was the margin from the h2.child-header. So you need to change it for a padding and then just modify the .child-header:after top value and that's all.

Hope I've been able to help you.