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Block-level Elements and Block Boxes in CSS
Block-level elements have their CSS display property set to either ‘block’, ‘list-item’, or ‘table’ and these elements force a line break above and below themselves. Block-level boxes are generated by each block-level element which is a part of the positioning scheme as well as contains child boxes.
Block container boxes contain either block-level boxes and follow block formatting context or contain inline-level boxes and follow inline formatting context. Block boxes is a term used if block-level boxes are also block containers.
Anonymous block boxes are those boxes over which developer has no control. If an inline box contains a block box and the inline content around the block box is enclosed in an anonymous block box.
Set the Form
First, set the form and its width −
form {
width:70%;
margin: 0 auto;
text-align: center;
}
Style the Child
Set the height and width for the child −
.child{
height: 40px;
width: 100%;
color: white;
border: 4px solid black;
}
The :nth-of-type(n) Selector
For the elements, we have used the :nth-of-type(n) selector. It matches every element that is the nth child, of the same tag of its parent −
<div id="container">Color Orange <div class="child"></div>Color Red <div class="child"></div>Color Violet <div class="child"></div> </div>
The nth Child
The above is set with :nth-of-type(n) selector −
.child:nth-of-type(1){
background-color: #FF8A00;
}
.child:nth-of-type(2){
background-color: #F44336;
}
.child:nth-of-type(3){
background-color: #C303C3;
}
Example
Let’s see an example to implement Block-level Elements and Block Boxes −
<!DOCTYPE html>
<html>
<head>
<title>CSS Block-level Elements and Block Boxes</title>
<style>
form {
width:70%;
margin: 0 auto;
text-align: center;
}
* {
padding: 2px;
box-sizing: border-box;
/*margin:5px;*/
}
.child{
height: 40px;
width: 100%;
color: white;
border: 4px solid black;
}
.child:nth-of-type(1){
background-color: #FF8A00;
}
.child:nth-of-type(2){
background-color: #F44336;
}
.child:nth-of-type(3){
background-color: #C303C3;
}
</style>
</head>
<body>
<form>
<fieldset>
<legend>CSS Block-level Elements and Block Boxes</legend>
<div id="container">Color Orange
<div class="child"></div>Color Red
<div class="child"></div>Color Violet
<div class="child"></div>
</div><br>
</form>
</body>
</html>
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