css

CSS is a stylesheet language that describes the presentation of an HTML (or XML) document. CSS describes how elements must be rendered on screen, on paper, or in other media. This tutorial will teach you CSS from basic to advanced.

Examples in Each Chapter

CSS Example

body { background-color: #d0e4fe; } h1 { color: orange; text-align: center; } p { font-family: "Times New Roman"; font-size: 20px; }

CSS Syntax

Learn to the CSS syntax :

< style="background-color: white; box-sizing: border-box; font-family: 'Segoe UI', Arial, sans-serif; font-size: 30px; margin: 10px 0px;">

        The selector points to the HTML element you want to style.

The declaration block contains one or more declarations separated by semicolons.

Each declaration includes a CSS property name and a value, separated by a colon.

A CSS declaration always ends with a semicolon, and declaration blocks are surrounded by curly braces.

In the following example all <p> elements will be center-aligned, with a red text color:

The id Selector:

The id selector uses the id attribute of an HTML element to select a specific element.

The id of an element should be unique within a page, so the id selector is used to select one unique element!

To select an element with a specific id, write a hash (#) character, followed by the id of the element.

The style rule below will be applied to the HTML element with id="para1":

The class Selector:

      The class selector selects elements with a specific class attribute.

To select elements with a specific class, write a period (.) character, followed by the name of the class.

In the example below, all HTML elements with class="center" will be red and center-aligned:

You can also specify that only specific HTML elements should be affected by a class.

In the example below, only <p> elements with class="center" will be center-aligned:

HTML elements can also refer to more than one class.

In the example below, the <p> element wil be styled according to class="center" and to class="large": 

• Grouping Selectors:

If you have elements with the same style definitions, like this:

• CSS Comments

            Comments are used to explain the code, and may help when you edit the source code at a later date.

      Comments are ignored by browsers. 

     A CSS comment starts with /* and ends with */. Comments can also span multiple lines:

              

CSS Backgrounds:-

Background Color:

         The background-color property specifies the background color of an element.

The background color of a page is set like this:

With CSS, a color is most often specified by:

• a HEX value - like "#ff0000"
• an RGB value - like "rgb(255,0,0)"
• a valid color name - like "red"

• In the example below, the <h1>, <p>, and <div> elements have different background colors:

Background Image:-

The background-image property specifies an image to use as the background of an element.

By default, the image is repeated so it covers the entire element.

The background image for a page can be set like this:

Syntax:- 

 

• Background Image - Repeat Horizontally or Vertically:

By default, the background-image property repeats an image both horizontally and vertically.

Some images should be repeated only horizontally or vertically, or they will look strange, like this:

If the image above is repeated only horizontally (background-repeat: repeat-x;), the background will look better:

• Background Image - Set position and no     repeat

Showing the backgound image only once is also specified by the background-repeat property:

In the example above, the background image is shown in the same place as the text. We want to change the position of the image, so that it does not disturb the text too much.

The position of the image is specified by the background-position property: