Z-Index

Duration: 5 min

This video lesson is available to enrolled students.

Return to /learn/RSSB-BASIC-COMPUTER-INSTRUCTOR/paper-2-web-development/css/css-text-properties/asset-z-index after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. About the Course: About the Course
  2. Paper-1 & 2 | Basic Numeracy: Ratio and Proportion (Ratios), Divisibility Rules, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Percentage, Average, Mensuration and Geometry, Age Problems, Arithmetic, Statistics, Probability, Profit and Loss, Simple Interest and Compound Interest, Partnership, Speed Mathematics and Basic Mathematics, Algebra, Powers and Exponents (Surds and Indices), Time and Work, Pipe and Cistern, RSSB Specific Videos - Basic Numeracy
  3. Paper-1 & 2 | Data Interpretation: Data Interpretation
  4. Paper-1 & 2 | General Mental Ability: Mental Ability, RSSB Specific Videos - Mental Ability
  5. Paper-1 & 2 | Logical Reasoning and Analytical Ability: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Syllogisms, Seating Arrangements, Blood Relations, Directions (Direction Test), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Venn Diagram, Analogy, Ranking, Order and Sequence, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Data Arrangement, Logical Sequence Of Words, Crypt Arithmetic
  6. Paper-1 & 2 | Decision Making and Problem Solving: Selection Decision Table (Decision Making)
  7. Paper-1 | General Science: Physics, Biology, Chemistry, RSSB Specific Videos
  8. Paper-1 | General Awareness: State Wise GK, GK- Current Affairs
  9. Paper - 2 | Digital Logic Systems: Digital Systems & Boolean Basics, Logic Gates & Hardware, Combinational Circuit, Sequential Circuits
  10. Paper-2 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Calculus, Relational Algebra, SQL, NoSQL
  11. Paper-2 | Data Structures & Algorithms: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Algorithm Analysis, Sorting Algorithms, Intro to Compilers, Hashing
  12. Paper 2 | Data Communication and Network Security: Introduction to CN, Data Communication, Data Link Layer - Ethernet, DLL: Error Control, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Application Layer, Hardware basics, Network Security, Ethical Hacking
  13. Paper-2 | Operating Systems: Introduction to OS, Process Management, Memory Management, File Management, Deadlock
  14. Paper-2 | Computer Organization and Architecture: Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations, Programming the Basic Computer, Number System, Number Representation
  15. Paper 2 | System Analysis and Design: Fundamentals of Systems and Information Systems, Fundamentals of Software Engineering, SDLC and Development Approaches, Software Documentation and Software Requirements Specification (SRS), SDD and Quality Assurance, Security, Risk Management & Maintenance, Software Testing
  16. Paper-2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  17. Paper 2 | OOPS , C++ , JAVA: Language Design, OOPS with C++, Java, .Net Programming, Java Fundamentals
  18. Paper 2 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  19. Emerging Trends and AI: Emerging Tech Trends, Artificial Intelligence
  20. Paper-2 | Data Processing (Ms-Office): MS Office Applications
  21. Paper-2 | Internet and Web Technologies: HTML Basics, CSS, XML, JavaScript-Basics, Internet Fundamentals, Protocols & Services, Web Publishing & Hosting, Server Side & Security, Emerging Technologies, Terms & Abbreviations, Cyber Threats and Malware Attacks, Role of Internet and Web Services, Security in Mobile and Wireless Computing, साइबर सुरक्षा / Cyber Safety and Security, कंप्यूटर नेटवर्क / Computer Networks
  22. Paper 2 | Pedagogy: Child Development, Theories, Concept of Pedagogy, Inclusive Education, Experiential Pedagogy, Assessment & Evaluation, Psychology, Curriculum Framework & Reforms, National Education Policy (NEP) 2020
  23. Live Classes: RSSB Live Sessions
  24. Paper 1 - Full Mock Tests:
  25. Paper 2 - Full Mock Tests:
  26. BCI Previous Year Papers:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture introduces the CSS z-index property, which controls the stacking order of positioned elements. The instructor explains that z-index only applies to elements with a position value such as relative, absolute, fixed, or sticky, and does not work on static elements. A code example demonstrates that setting z-index: -1 on an image places it behind the text, while positive values bring elements forward. The instructor annotates slides with checkmarks next to valid position values, circles key terms like 'positioned' and 'value', and writes notes indicating top and bottom stack order using positive and negative numbers. The visual output confirms the stacking behavior, showing the image positioned behind the paragraph text.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video introduces the CSS z-index property, explaining that it specifies the stack order of positioned elements. The on-screen text displays 'The CSS z-index Property' and the syntax 'z-index: value;'. The instructor highlights that this property only works on elements with a position value such as relative, absolute, fixed, or sticky. A code example is shown where an image has 'position: absolute;' and 'z-index: -1;', placing it behind the text. The visual output confirms the stacking behavior, with the image appearing behind the paragraph.

  2. 2:00 – 5:00 02:00-05:00

    The instructor continues explaining z-index, annotating the slide with checkmarks next to position values (relative, absolute, fixed, sticky) and writing 'Static' in a circle to contrast with positioned elements. The instructor circles the word 'value' in the z-index syntax and writes notes indicating top and bottom stack order with positive and negative numbers. In the code example, the instructor circles the 'img' selector and the word 'absolute', then points to the z-index value of -1. The on-screen text includes 'Because the image has a z-index of -1, it will be placed behind the text.' The instructor uses a red pen to circle and underline key terms like 'positioned', 'absolute', and '-1'.

  3. 5:00 – 5:01 05:00-05:01

    The final moment of the video shows the completed slide with all annotations in place. The on-screen text displays 'The CSS z-index Property', the definition, the syntax block with annotations for top and bottom stack order, and the code example 'img { position: absolute; z-index: -1; }'. The rendered output shows the image behind the text, confirming the negative z-index behavior. This brief window captures the end state of the lecture's visual explanation.

The central concept is that z-index controls stacking order but only for positioned elements. The key rule is that static positioning does not support z-index, while relative, absolute, fixed, and sticky do. Negative values push elements behind content, positive values bring them forward. The worked example uses an image with z-index: -1 to demonstrate the behind-text effect. The instructor's annotations emphasize the distinction between valid position values and static, reinforcing that z-index is meaningless without a non-static position property.

Loading lesson…