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CSS

CSS stands for Cascading Style Sheets.CSS is mainly used to present the layout of webpage.Most of facilities which are not available in html are present here.specially colors,fonts and layouts are establish in css sheets.CSS should be saved with .css extension.CSS specifications are maintained by W3C.

CSS can be added in 3 ways.
i)Inline -   By using the style attribute in HTML elements
          This method is used to add style to the specific tag
          Eg: <html>
                <body>
                 <h1 style="color:blue;">hello</h1>
                                                         </body>
                                                        </html>
             
ii)Internal - By using <style> element in the <head> section
                   This is used to add style for a single web page
                     Eg:<html>
                          <head>
<style>
body{background-color: green;}
p{color: red;}
</style>
</head>
<body>
<p>hello</p>
</html>
iii)External By using an external css file
This is used to add style using external style sheet
Eg::<html>
       <head>
<link rel="stylesheet" href="style.css">
</head>
<body>
<p>hello</p>
</html>

Main important things in CSS than HTML
1)CSS colors
  We can insert the color in many ways.
    rgb(red, green, blue)
    hexadecimal value #ff0000
    hsl value(hue, saturation, lightness)
  i)background color
    <h1 style="background-color:DodgerBlue;">Hello World</h1>
  ii)text color
    <h1 style="color:Tomato;">Hello World</h1>
  iii)border color
    <h1 style="border:2px solid Tomato;">Hello World</h1>
  

 2)CSS backgrounds
 background-color
   background-color: lightblue;
 background-image
   background-image: url("paper.gif");
 background-repeat
   background-repeat: repeat-x;
 background-attachment
   background-attachment: fixed;
 background-position
   background-position: right top;

 3)CSS border
p.dotted {border-style: dotted;}
p.dashed {border-style: dashed;}
p.solid {border-style: solid;}
p.double {border-style: double;}
 
4)CSS margin
  margin-top: 100px;
  margin-bottom: 100px;
  margin-right: 150px;
  margin-left: 80px;

 5)CSS boxmodel
Css boxmodel consist content,padding,border and margin.Content is as usual appear of text and images.Padding is a area around content.Border is around the padding.Margin clears an area outside border.
    width: 300px;
  border: 25px solid green;
  padding: 25px;
  margin: 25px;

 6)CSS text
   as usual in HTML but some others as follows
     text-decoration: overline;
   text-transform: uppercase;
   text-indent: 50px;

 7)CSS icons
  <i class="fa fa-cloud"></i>
 <i class="fa fa-heart"></i>
 <i class="fa fa-car"></i>

8)CSS navigation bar
     Nav bar is very important because of its role now a days website.
<ul>
  <li><a href="default.asp">Home</a></li>
  <li><a href="news.asp">News</a></li>
  <li><a href="contact.asp">Contact</a></li>
  <li><a href="about.asp">About</a></li>
</ul>

9)CSS overflow
  overflow: visible;
10)CSS image gallery
   As usual in HTML we used image code further that call href and div for gallery.
11)CSS tables
    Same as HTML but easily add color or any other format by calling class.
th {
  background-color: #4CAF50;
  color: white;}
12)CSS lists
ul.a {
  list-style-type: circle;}

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