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CSS
CSS Introduction CSS Syntax CSS Selector How To Add CSS CSS Comments CSS Colors CSS Background color CSS background-image CSS Borders CSS Margins CSS Height, Width and Max-width CSS Box Model CSS Outline CSS Text CSS Fonts CSS Icon CSS Links CSS Tables CSS Display CSS Maximum Width CSS Position z-index Property
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JQuery
What is jQuery? Benefits of using jQuery Include jQuery Selectors. Methods. The $ symbol and shorthand. Selecting elements Getting and setting content Adding and removing elements Modifying CSS and classes Binding and Unbinding events Common events: click, hover, focus, blur, etc Event delegation Using .on() for dynamic content Showing and hiding elements Fading elements in and out Sliding elements up and down .animate() Understanding AJAX .ajax() .load(), .get(), .post() Handling responses and errors. Parent Chlid Siblings Filtering Elements Using find Selecting form elements Getting form values Setting form values Form validation Handling form submissions jQuery plugins Sliders plugins $.each() $.trim() $.extend() Data attributes Debugging jQuery code
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Bootstrap 4
What is Bootstrap Benefits of using Setting up Container Row and Column Grid Classes Breakpoints Offsetting Columns Column Ordering Basic Typography Text Alignment Text colors Backgrounds Display Font Size Utilities Buttons Navs and Navbar Forms Cards Alerts Badges Progress Bars Margin Padding Sizing Flexbox Dropdowns Modals Tooltips Popovers Collapse Carousel Images Tables Jumbotron Media Object
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PHP
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MY SQL
SQL Introduction Syntax Select statement Select Distinct WHERE Clause Order By SQL AND Operator SQL OR Operator SQL NOT Operator SQL LIKE SQL IN SQL BETWEEN SQL INSERT INTO SQL NULL Values SQL UPDATE SQL DELETE SQL TOP, LIMIT, FETCH FIRST or ROWNUM Clause SQL MIN() and MAX() Functions SQL COUNT() Function SQL SUM() SQL AVG() SQL Aliases SQL JOIN SQL INNER JOIN SQL LEFT JOIN SQL RIGHT JOIN SQL FULL OUTER JOIN SQL Self Join SQL UNION SQL GROUP BY SQL HAVING SQL EXISTS SQL ANY and ALL SQL SELECT INTO SQL INSERT INTO SELECT SQL CASE SQL NULL Functions SQL Stored Procedures SQL Comments SQL Operators SQL CREATE DATABASE SQL DROP DATABASE SQL BACKUP DATABASE SQL CREATE TABLE SQL DROP TABLE SQL ALTER TABLE SQL Constraints SQL NOT NULL SQL UNIQUE Constraint SQL PRIMARY KEY SQL FOREIGN KEY SQL CHECK Constraint SQL CREATE INDEX SQL AUTO INCREMENT SQL Dates SQL Views SQL Injection SQL Hosting SQL Data Types
Margin Bootstrap
In Bootstrap 4, margins can be managed using a set of predefined classes that follow a consistent naming convention. These classes are used to add spacing around elements in a flexible way. Here's a breakdown of how margin classes work in Bootstrap 4:
Margin Classes
The margin classes in Bootstrap 4 are formatted as follows:
m{t|r|b|l|x|y}-{size}
Where:
m
stands for margin.t
stands for top.r
stands for right.b
stands for bottom.l
stands for left.x
stands for horizontal (left and right).y
stands for vertical (top and bottom).{size}
is a number from 0 to 5, where each number represents a different margin size.
Margin Sizes
The sizes range from 0 to 5, with the following pixel values:
0
: 0px (no margin)1
: 0.25rem (4px)2
: 0.5rem (8px)3
: 1rem (16px)4
: 1.5rem (24px)5
: 3rem (48px)
Examples
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Margin on All Sides
To apply a margin of 3 units (16px) to all sides of an element:
<div class="m-3">Content</div>
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Margin on the Top
To apply a margin of 2 units (8px) to the top of an element:
<div class="mt-2">Content</div>
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Margin on the Right
To apply a margin of 4 units (24px) to the right of an element:
<div class="mr-4">Content</div>
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Margin on the Bottom
To apply a margin of 1 unit (4px) to the bottom of an element:
<div class="mb-1">Content</div>
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Horizontal Margin
To apply a margin of 5 units (48px) to both the left and right of an element:
<div class="mx-5">Content</div>
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Vertical Margin
To apply a margin of 3 units (16px) to both the top and bottom of an element:
<div class="my-3">Content</div>
Responsive Margins
Bootstrap 4 also allows for responsive margins, which means you can apply different margins at different breakpoints. The format for responsive margins is:
m{t|r|b|l|x|y}-{size}-{breakpoint}
For example, to apply a margin of 2 units on the top for small screens and 4 units for medium screens and up:
<div class="mt-2 mt-md-4">Content</div>
This will apply a margin of 8px on the top for screens smaller than 768px and 24px for screens 768px and larger.
These classes make it easy to manage spacing and maintain consistency across your Bootstrap-based designs.
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