CSS Complete Guide - A to Z CSS Concepts Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report What is CSS ?CSS stands for "Cascading Style Sheet". It is used to style HTML Documents. CSS simplifies the process of making web pages presentable. It describes how web pages should look it prescribes colors, fonts, spacing, and much more.CSS Complete GuideWhat is CSS Complete Guide ?CSS Complete Guide is a list of A to Z CSS concepts from beginner to advanced levels.Table of ContentsCSS BasicsCSS SelectorsCSS PropertiesCSS ModulesCSS FunctionsCSS CombinatorsCSS Pseudo-classes & ElementsCSS At-rulesCSS Interview PreparationCSS Practice QuizCSS FrameworksCSS Course & Cheat SheetCSS BasicsCSS IntroductionCSS SyntaxCSS CommentsCSS SelectorsCSS ColorsCSS BackgroundCSS BordersCSS Margins and PaddingCSS Height and WidthCSS OutlineCSS IconsCSS LinksCSS ListsCSS TablesCSS Display propertyCSS max-width PropertyCSS Positioning ElementsCSS z-index PropertyCSS OverflowCSS FloatCSS AlignCSS CombinatorsCSS Opacity / TransparencyCSS DropDownsCSS Image GalleryCSS Image SpritesCSS CountersCSS Website LayoutCSS UnitsCSS SpecificityHow to apply !important in CSS?CSS SelectorsCSS SelectorsSimple SelectorClass SelectorsID SelectorsElement SelectorAttribute SelectorsGroup SelectorPseudo-Class SelectorPseudo-Element SelectorUniversal SelectorsWildCard SelectorCSS Selectors Complete ReferenceCSS PropertiesCSS accent-color PropertyCSS all PropertyCSS alignCSS AnimationsCSS aspect-ratio PropertyCSS backdrop-filter PropertyCSS backface-visibility PropertyCSS BackgroundCSS BordersCSS block-size PropertyCSS Bottom PropertyCSS padding-bottom PropertyCSS margin-bottom PropertyCSS box PropertyCSS box-sizing PropertyCCSS box decoration break PropertyCSS box-shadow PropertyCSS break PropertyCSS break-after propertyCSS break-before PropertyCSS break-inside propertyCSS word-break PropertyCSS clip-path PropertyCSS color PropertyCSS column PropertyCSS column-fill PropertyCSS column-count PropertyCSS column-width PropertyCSS column-rule PropertyCSS column-span PropertyCSS column-rule-width PropertyCSS column-gap PropertyCSS columns PropertyCSS content PropertyCSS CountersCSS counter-increment PropertyCSS counter-reset PropertyCSS Display propertyCSS cursor PropertyCSS direction PropertyCSS filter PropertyCSS flex Property CSS FloatCSS FontsCSS grid PropertyCSS height Property CSS image-rendering PropertyCSS inset Property CSS justify PropertyCSS justify-content PropertyCSS justify-self PropertyCSS |eft PropertyCSS letter-spacing PropertyCSS line-height PropertyCSS list PropertyCSS list-style PropertyCSS list-style-image Property CSS list-style-position PropertyCSS list-style-type PropertyCSS margin-top PropertyCSS margin-right PropertyCSS margin-bottom PropertyCSS margin-left PropertyCSS Mask PropertyCSS mask-clip PropertyCSS mask-composite PropertyCSS mask-image PropertyCSS mask-origin PropertyCSS mask-position PropertyCSS mask-repeat PropertyCSS mask-size PropertyCSS max PropertyCSS max-block-size PropertyCSS max-height PropertyCSS max-inline-size PropertyCSS max-width PropertyCSS min PropertyCSS min-block-size PropertyCSS min-height PropertyCSS min-inline-size PropertyCSS min-width PropertyCSS mix-blend-mode PropertyCSS object-fit PropertyCSS object-position PropertyCSS Opacity / Transparency PropertyCSS order propertyCSS Outline PropertyCSS overflow PropertyCSS overscroll-behavior PropertyCSS overscroll-behavior-inline PropertyCSS overscroll-behavior-x PropertyCSS overscroll-behavior-y PropertyCSS Padding PropertyCSS padding-top PropertyCSS padding-right PropertyCSS padding-bottom PropertyCSS padding-left PropertyCSS position PropertyCSS text PropertyCSS text-align PropertyCSS text-decoration PropertyCSS text-overflow PropertyCSS text-justify PropertyCSS text-shadow PropertyCSS text-transform PropertyCSS transform PropertyCSS transform-origin PropertyCSS transform-style PropertyCSS transition PropertyCSS transition-delay PropertyCSS transition-duration PropertyCSS transition-timing-function PropertyCSS word-break PropertyCSS word-spacing PropertyCSS z-index PropertyCSS Properties Complete ReferenceCSS ModulesCSS AnimationsCSS animation PropertyCSS animation-delay PropertyCSS animation-direction PropertyCSS animation-duration PropertyCSS animation-fill-mode PropertyCSS animation-iteration-count PropertyCSS animation-name PropertyCSS animation-play-state PropertyCSS animation-timing-function PropertyCSS BordersBorder StyleBorder WidthBorder ColorBorder radius propertyCSS BackgroundCSS background-color PropertyCSS background-image PropertyCSS background-attachment PropertyCSS background-position PropertyCSS background-origin propertyCSS background-clip PropertyCSS alignCSS align-content PropertyCSS align-items PropertyCSS align-self PropertyCSS text-align PropertyCSS vertical-align PropertyCSS Box modelCSS BordersCSS MarginsCSS PaddingWhat is the cascading order of the three types of CSSHow to apply concept of inheritance in CSSCSS VariablesCSS colorsCSS conditional rulesWhat is Float Containment in CSSCSS displayCSS fontsCSS grid layoutCSS imagesCSS media queriesCSS Nesting & GroupingCSS FunctionsCSS abs() FunctionCSS acos() FunctionCSS asin() FunctionCSS atan() FunctionCSS atan2() FunctionCSS attr() FunctionCSS calc() FunctionCSS clamp() FunctionCSS cos() FunctionCSS env() FunctionCSS max() FunctionCSS min() FunctionCSS sin() FunctionCSS tan() FunctionCSS url() FunctionCSS var() FunctionCSS Functions Complete ReferenceCSS CombinatorsCSS CombinatorsCSS Adjacent sibling combinatorCSS Child combinatorCSS Descendant combinatorCSS General sibling combinatorCSS Namespace separatorCSS Selector listCSS Pseudo-classes & ElementsCSS Pseudo-classesCSS :active pseudo-class CSS :any-link pseudo-class CSS :autofill pseudo-class CSS :checked pseudo-class CSS :dir() pseudo-class CSS :first-child pseudo-class CSS :first-of-type pseudo-class CSS :focus pseudo-class CSS :focus-within pseudo-class CSS :has() pseudo-class CSS :hover pseudo-class CSS :in-range pseudo-class CSS :indeterminate pseudo-class CSS :invalid pseudo-class CSS :lang() pseudo-class CSS :nth-child() pseudo-class CSS :nth-last-child() pseudo-class CSS :nth-last-of-type() pseudo-class CSS :nth-of-type() pseudo-class CSS :scope pseudo-classCSS :visited pseudo-class CSS :where() pseudo-class CSS Pseudo-ElementsCSS ::afterCSS ::beforeCSS ::first-letterCSS ::first-lineCSS ::markerCSS ::placeholderCSS ::selectionCSS At-rulesCSS At-RulesCSS @charset RuleCSS @color-profile RuleCSS @container RuleCSS @counter-style RuleCSS @font-face RuleCSS @font-feature-values RuleCSS @font-palette-values RuleCSS @import RuleCSS @keyframes RuleCSS @layer RuleCSS @media RuleCSS @namespace RuleCSS @page RuleCSS @property RuleCSS @supports RuleCSS Interview PreparationCSS Interview Questions and Answers (2023)CSS Practice QuizCSS Quiz | Set-1CSS Quiz | Set-2CSS Quiz | Set-3CSS FrameworksBootstrap 5Bulma CSSFoundation CSSMaterialize CSSOnsen UIPure CSSSemantic UISpectre CSSTailwind CSSCSS Course & Cheat SheetCSS Free CourseCSS Cheat Sheet – A Basic Guide to CSS Comment More infoAdvertise with us Next Article CSS Introduction Anonymous Improve Article Tags : Web Technologies CSS A-Z Guides Similar Reads CSS Tutorial CSS stands for Cascading Style Sheets. It is a stylesheet language used to style and enhance website presentation. CSS is one of the three main components of a webpage, along with HTML and JavaScript.HTML adds Structure to a web page.JavaScript adds logic to it and CSS makes it visually appealing or 7 min read CSS Introduction CSS (Cascading Style Sheets) is a language designed to simplify the process of making web pages presentable.It allows you to apply styles to HTML documents by prescribing colors, fonts, spacing, and positioning.The main advantages are the separation of content (in HTML) and styling (in CSS) and the 4 min read CSS Syntax CSS is written as a rule set, which consists of a selector and a declaration block. The basic syntax of CSS is as follows:The selector is a targeted HTML element or elements to which we have to apply styling.The Declaration Block or " { } " is a block in which we write our CSS.HTML<html> <h 2 min read CSS Selectors CSS Selectors are used to target HTML elements on your pages, allowing you to apply styles based on their ID, class, type attributes, and more. There are mainly 5 types of selectors.Basic CSS Selectors: These are used to target elements by tag, .class, or # ID for fundamental styling needs.Combinato 7 min read CSS Comments CSS comments are used to add notes or explanations to your code, helping you and others understand it better. They start with /* and end with */ and can be used for both single-line and multi-line comments. Note: Comments are ignored by browsers, so they won’t affect how your webpage looks or works. 2 min read CSS Colors CSS colors are used to set the color of different parts of a webpage, like text, background, and borders. This helps make the page look more attractive and easier to read. You can define colors using names, hex codes, RGB values, and more.You can try different formats of colors here- #content-iframe 5 min read CSS Borders Borders in CSS are used to create a visible outline around an element. They can be customized in terms ofWidth: The thickness of the border.Style: The appearance of the border (solid, dashed, dotted, etc.).Color: The color of the border.You can try different types of borders here- #custom-iframe{ he 5 min read CSS Margins CSS margins are used to create space around an element, separating it from neighboring elements and the edges of the webpage. They control the layout by adjusting the distance between elements, providing better organization and readability.Syntax:body { margin: value;}HTML<html> <head> 4 min read CSS Height and Width Height and Width in CSS are used to set the height and width of boxes. Their values can be set using length, percentage, or auto.Width and HeightThe width and height properties in CSS are used to define the dimensions of an element. The values can be set in various units, such as pixels (px), centim 4 min read CSS Outline CSS outline is a property used to draw a line around an element's border. It does not affect the layout, unlike borders. It's often used to highlight elements, providing a visual emphasis without altering the dimensions of the element.Syntaxselector{ outline: outline-width outline-type outline-color 4 min read Like