CSS & CSS3 Cheatsheet

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CSS is a language that describes the style of an HTML document. CSS describes how HTML elements should be displayed.

CSS stands for Cascading Style Sheets. CSS saves a lot of work becuase it can control the layout of multiple web pages all at once.

CSS rule-set consists of a selector and a declaration block , see the following image.

structure of CSS styling

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

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

for example:

p {
  color: red;
  text-align: center;

p in the example is the selector. p is selecting the paragraph element in HTML which is <p>.

color is a property for the text color. Its value is red which means that the text color is red.

And the property text-align means the alignment of the text. Its value is center which means the text will be centered in the HTML element.

CSS Selectors ๐Ÿ”—

Basic CSS Selectors ๐Ÿ”—

You can select HTML elements by tag name, class name or id name.

If you want to select this HTML element:

<span class="center">Some Text Goes Here.</span>

You can use the class as selector like this:

.center {
  text-align: center;
  color: red;

But if you want to select all the paragaraph HTML elements like those:

  some paragraph written here. with more words than I think.
  another paragraph which is located in any area in the HTML document.

You can select all paragraph elements in HTML web page by this code:

p {
  color: brown;

But if you want to select an HTML element by its id like this

<h1 id='blogtitle'>LearnS7</h1>

You can use it like this in CSS:

#blogtitle {
  font-weight: bold;
  color: black;

More Advanced CSS Selectors ๐Ÿ”—

You can select all HTML elements and give them a style by using the asterisk (wildcard) like this code.

* {
  margin: 0;
  padding: 0;

If you want to select more than one HTML element