CSS Syntax
Syntax
The CSS syntax is made up of three parts: a selector, a property and a value:
selector {property: value} |
The selector is normally the HTML element/tag you wish to define, the property is the
attribute you wish to change, and each property can take a value. The property and value
are separated by a colon, and surrounded by curly braces:
Note: If the value is multiple words, put quotes around the value:
p {font-family: "sans serif"}
|
Note: If you wish to specify more than one property, you must separate each
property with a semicolon. The example
below shows how to define a center aligned paragraph, with a red text color:
p {text-align:center;color:red}
|
To make the style definitions more readable, you can describe one
property on each line, like this:
p
{
text-align: center;
color: black;
font-family: arial
}
|
Grouping
You can group selectors. Separate each selector with a comma. In the
example below we have grouped all the header elements. All header elements will
be displayed in green text color:
h1,h2,h3,h4,h5,h6
{
color: green
}
|
The class Selector
With the class selector you can define
different styles for the same type of HTML element.
Say that you would like to have two types of
paragraphs in your document: one right-aligned paragraph, and one center-aligned
paragraph. Here is how you can do it with styles:
p.right {text-align: right}
p.center {text-align: center}
|
You have to use the class attribute in your HTML document:
<p class="right">
This paragraph will be right-aligned.
</p>
<p class="center">
This paragraph will be center-aligned.
</p>
|
Note: To apply more than one class per given element, the syntax is:
<p class="center bold">
This is a paragraph.
</p>
|
The paragraph above will be styled by the class "center" AND the class
"bold".
You can also omit the tag name in the selector to define a style that
will be used by all HTML elements that have a certain class. In the example
below, all HTML elements with class="center" will be center-aligned:
.center {text-align: center}
|
In the code below both the h1 element and the p element have class="center". This means that both elements will follow the
rules in the ".center" selector:
<h1 class="center">
This heading will be center-aligned
</h1>
<p class="center">
This paragraph will also be center-aligned.
</p>
|
Do NOT start a class name with a number! It will not work in Mozilla/Firefox. |
Add Styles to Elements with Particular Attributes
You can also apply styles to HTML elements with particular attributes.
The style rule below will match all input elements that have a type attribute with a value
of "text":
input[type="text"] {background-color: blue}
|
The id Selector
You can also define styles for HTML elements with the id selector. The id
selector is defined as a #.
The style rule below will match the element that has an id attribute with a value
of "green":
The style rule below will match the p element that has an
id with a value of "para1":
p#para1
{
text-align: center;
color: red
} |
|
Do NOT start an ID name with a number! It will not work in Mozilla/Firefox. |
CSS Comments
Comments are used to explain your code, and may help you when
you edit the source code at a later date. A comment will be ignored by
browsers. A CSS comment begins with "/*", and ends with "*/", like this:
/* This is a comment */
p
{
text-align: center;
/* This is another comment */
color: black;
font-family: arial
}
|
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