What causes the top and left border to appear as separate lines instead of a single line?

div {
  border: 1px solid red;
}
.one {
  height: 20px;
  width: 20px;
}
.two {
  height: 30px;
  width: 30px;
}
<div class="one">
  <div class="two">
  </div>
</div>

Within the structure of a DOM tree, the .two div is classified as a child of the .one div. This parent-child relationship does not influence the positioning of the two elements.

Observing the diagram below, it's clear that the top and left borders do not form a single line. This raises the question of why the smaller box appears to be closer to the center of the screen?

https://i.sstatic.net/BLVZd.png

Keep in mind: In the realm of computer graphics, the top-left corner of the display functions as the center of the screen. This query pertains to those starting out in HTML and CSS.

htmlcss

Answer №1

The two lines do not connect because the .two element is nested within the .one element.

Imagine a div with a border as a room surrounded by walls, and inside this room is another room also surrounded by walls. Your expectation was for these 'rooms' to stack on top of each other, but in HTML/CSS, they are actually placed inside each other. To make the lines connect, you can adjust the positioning of the .two element with negative margins like this:

.two {
    height: 30px;
    width: 30px;
    margin: -1px 0 0 -1px;
}

By doing this, the .two element will appear as if it is stacked on top of the other element.

Answer №2

I am noticing two inquiries in this discussion:

Why are the top and left borders not displayed as a single line?

This is due to the nature of CSS; to achieve a single line, you must utilize only the border-right and border-bottom properties for your inner div. Alternatively, you can set border-top and border-left to 0.

Why is the smaller box positioned in the center of the screen?

Regarding your recent update: The reason for this is that the class 'one' encompasses 'two', but there is no border merging capability in CSS. Hence, your large div is positioned "within" your small div, causing overflow.

If this explanation is unclear, consider utilizing distinct colors to distinguish between your div elements.

Answer №3

try out this code snippet:

<div id="container">
     <div id="box">
 </div>
</div>

#container{
    height:150px;
    width:150px;
    border-color:blue;
    border-width:2px;
    border-style:dotted;
}

#box{
   height:75px;
   width:75px;
   border-color:green;
   border-width:2px;
   border-style:dotted;
   position:absolute;
    top:-2px;
   left:-2px;
}

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