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What is CSS? And how to Use CSS in three different ways

By Rajesh on 1/6/2014

What is CSS?

  • CSS stands for Cascading Style Sheets.
  • By using CSS we can set how to display HTML elements of html page.
  • In se of  External CSS  we can set the style of html element in external CSS files.

First of all we make one html page. After that we can apply CSS on this html page in different ways.

Note -: We save html page with .html extension. And save CSS file with .CSS extension.

<html>
<head>
<title>Login Pagetitle>
</head>
<body>
<table id="table" class"table1">
<tr>
<td>User Name :td><td><input id="name" class="login" type="text"/>td>tr>
<tr><td>Password :td><td><input id="password" class="login" type="text"/>td>tr>
<tr><td>td><td><input id="btn1" class="btnlogin" type="Button" value="Login"/> td>

 

 

 

 



 

We can use css in following three ways.

1. Inline CSS.

2. Internal CSS.

3. External CSS.

Inline CSS (Not recommended)

If we use inline CSS then we give the style to the html textbox or button etc. and set the style of that html element. 

Note -: Inline CSS is not recommended and not good for practice. When we use inline CSS then we set all CSS style property for each html element. 

<Html><head>
<Title>Inline css Exampletitle>
<Body>
<table id="table" class"table1" style="background-color:yellow; border:2px;  border-style:solid; border-color:black;">
<Tr><td>User Name :td><td>
<input id="name" class="login" type="text" style="background-color:red"/>td>tr>
<Tr><td>Password :td><td>
<input id="password" class="login" type="text" style="background-color:red"/>td>tr>
<tr><td>td><td>
<input id="btn1" class="btnlogin" type="Button" value="Login" style="background-color:red"/> td>tr>

Output -:

  • Internal CSS (Not recommended).

If we use internal CSS then we give the style to the html textbox or button etc. and set the style of that html element in that html page in tag. 

Note -: Internal CSS is not recommended and it also not good for practice. When we use internal CSS then we write all CSS file code on html page for set all CSS style property of html element.

<html>
<head>
  <title>internal csstitle>
  <style>
  #table
  {
  border-width:2px;
  border-color:black;
border-style:solid;
  background-color:yellow;
  }
  #name
  {
  background-color:red;
  }
  #password
  {
  background-color:red;
  }
  #btn1
  {
    background-color:red;
  }
  style>
<body>
<table id="table" class"table1">
<tr><td>User Name :td><td>
<input id="name" class="login" type="text"/>td>tr>
<tr><td>Password :td><td>
<input id="password" class="login" type="text"/>td>tr>
<tr><td>td><td>
<input id="btn1" class="btnlogin" type="Button" value="Login"/> td>tr>

OutPut -:

  • External CSS (Recommended) 
         

In use of External CSS we make an external CSS file and set the style of html element (for ex. textbox or buttons) and attach this CSS file with html page.

Note -: External CSS is recommended and it also good for practice. When we use External CSS then we write all CSS code in External CSS file. And we set all CSS style property of html element in that External CSS File. If we wants change style of html page or html element then we can easily change style property of html element in external CSS file.

  .table1
  {
  border:2px;
  border-style:solid;
  border-color:black;
  background-color:yellow;
  }
  .login
  {
  background-color:red;
  }
  .btnlogin
  {
    background-color:red;
  }
For Ex.
<html>
<head>
  <title>internal csstitle>
  <link href="/external.css" rel="stylesheet" type="text/css">
<body>
<table id="table" class="table1">
<tr><td>User Name :td><td>
<input id="name" class="login" type="text"/>td>tr>
<tr><td>Password :td><td>
<input id="password" class="login" type="text"/>td>tr>
<tr><td>td><td>
<input id="btn1" class="btnlogin" type="Button" value="Login"/> td>tr>

OutPut -:

We can use CSS by class and id -:

1. class

If we use css by class then we can set the style of that html element on the basis of class name of that html element with (.dot) operator.  

.table1
  {
  border:2px;
  border-style:solid;
   border-color:black;
  background-color:yellow;
  }
  .login
  {
  background-color:red;
  }
  .btnlogin
  {
    background-color:red;
  }

2.id

If we use css by id then we can set the style of that html element on the basis of id of that html element with (# hash) operator.  

#table
  {
  border:2px;
  border-style:solid;
  border-color:black;
  background-color:yellow;
  }
  #name
  {
  background-color:red;
  }
  #password
  {
  background-color:red;
  }
 
  #btn1
  {
    background-color:red;
  }

 


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