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Introduction to CSS

Introduction to CSS

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CSS stands for Cascade Style Sheet.

The CSS language is responsible for the presentation of a web page, how the page will look like. 

It is through CSS that we define fonts, colors, layouts, borders, alignments, margins, fills and even animations. 

In a forgotten past, this was done through HTML itself, but today this approach is considered bad practice and should not be used.

CSS Syntax

css syntax example - coding180


  1. selector - name reference.
  2. Open Rule - starting point of css rules.
  3. property name: represents the name of the property.
  4. property separator: distinguishes between name and value.
  5. property value: represents the value of the property. 
  6. End declaration of each property with a semicolon.
  7. When you are done with your declaration, you end you rule with right curly brace.

Styles are applied to HTML elements through rules. A rule is made up of the selector and a set of declarations  (properties) enclosed in braces and separated by semicolons. 

declaration consists of a property name and property value separated by a colon.

selector allows you to identify which elements the rule will apply to.

Task - Exercise 1

Give it a try: modify font size with css style code

Modify the font size with in line 9

font-size:12px; to font-size:20px;

Run the program and see the result:

Task Code:

<!DOCTYPE html>

    <meta charset="UTF-8">
    <title>Know CSS style -</title>
    <style type="text/css">
    p {
        font-size: 12px;
        /*Set text font size*/
        color: red;
        /*Set text color*/
        font-weight: bold;
        /*Set font bold*/

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Robort Gabriel

Lagos, Nigeria

Freelance Web Developer, Native Android Developer, and Coding Tutor.

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