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Flexbox in CSS: A Complete Guide

We’ll go over the fundamentals of Flexbox and show you how to get started with this powerful tool in this article.

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What is Flexbox?

The CSS style module known as Flexbox, or Flexible Box Layout, makes it simple to handle its contents’ layout. This will enable you to produce sophisticated and dynamic designs with less code.

It also provides a more effective way to organize, align, and distribute space between things in a container. Flexbox container is a CSS-style parent element that produces a flexible Flexbox layout.

By describing the features of the container and its child elements, Flexbox allows you to manage the layout of a container and its contents. Before Flexbox, positioning, float attributes, and several manual computations were needed to create structures in CSS.

Why do we need Flexbox in CSS?

Flexbox provides a powerful and flexible way to create layouts in CSS. Its ease of use and responsiveness make it an essential tool for modern web development.

Flexbox is an advanced CSS layout tool that allows developers to quickly create flexible and adaptable layouts. Here are some of the reasons why we require Flexbox

What is a Flexbox container?

The “flex” value is a shorthand property in CSS that allows you to set the flexible properties of a flex container or item. It is used to create flexible layouts where the elements can adjust their size and position based on the available space.

When applied to a flex container, it sets the container’s main axis and cross-axis properties. When applied to a flex item, it sets the item’s size, order, and alignment properties within the container.

A flexbox container, also known as a flex container, is a CSS layout container that allows its child elements to be arranged flexibly along a single axis or in several dimensions. It includes a sophisticated and simple layout system that allows you to customize the size, location, and spacing of the container’s child elements.

You may design complicated and responsive layouts without resorting to hacks or workarounds by setting the relevant flexbox settings on the container. Modern browsers largely support the flexbox layout concept, which is commonly used for designing UI components, navigation menus, grids, and more.

Properties for the Flex Items

Properties for the Flex Items

Flex items are child elements of a Flexbox container that may be enhanced using numerous CSS attributes to control their size, location, and functionality within the Flexbox layout.  Flexbox can also be utilized to regulate the arrangement and alignment of flex objects inside a container. Below are a few of the most popular properties we use for Flexbox. These properties can be applied to both the container and the individual flex items. By changing these properties, you can create complex and dynamic layouts with ease.

  1. Flex– a shortened term for the properties flex-grow, flex-shrink, and flex-basis. In CSS Flexbox layout, flex-grow defines the ability for a flex item to grow if necessary, flex-shrink defines the ability for a flex item to shrink if necessary, and flex-basis defines the initial size of a flex item before any remaining space is distributed.
  2. Align-self– This property is used to override the alignment set by the Flexbox container for a specific flex item. It can be used to align a single item along the cross-axis differently from the other items.
  3. Order– establishes the sequence in which the flex items should appear in the container. The default value is 0.
  4. Display– Defines the container as a flex container. The value should be “flex”.                              
  5. Flex-direction— determines the major axis’ direction. Row (default value), column, row-reverse, or column-reverse are the possible values.                                                                                 
  6. Flex-wrap– Determines whether the flex items should wrap onto the next line. The values can be no wrap (default), wrap, or wrap-reverse.
  7. Align-items– defines the cross-axis alignment for the items. Values can be Stretch (the default value), flex-start, flex-end, center, or baseline are the possible possibilities.
  8. Align-content– How the objects should be arranged along the cross-axis when the container has additional space. The values can be stretch, space-around, space-between, flex-start, or flex-end.
  9. Justify-content– If justified-content is set to flex-start, flex-end, center, space-between, space-around, or space-evenly, flex elements will be aligned along the main axis as specified.

How Flexbox works?

A flexbox layout is made up of a flex container and its child elements. The “flex” value is a shorthand property in CSS that allows you to set the flexible properties of a flex container or flex item.

By using the display feature with the value “flex”, the container is defined. The container’s child elements turn into flex items once it is classified as a flex container. The Flexbox properties can then be used to position and align the flex elements inside the container.

There are two types of axes in a Flexbox layout; the central axis and the cross axis. The  central axis is the direction in which the flex items are laid out, and the cross axis is perpendicular to the central axis.

The flex-direction feature allows the main axis to be oriented either horizontally or vertically. The flex-direction default value is row, which arranges the items horizontally from left to right. If the value is changed to the column, the items will be laid out vertically from top to bottom.

The cross-axis is in the opposite direction of the main axis. By default, the cross-axis is perpendicular to the main axis. However, this can be changed using the flex-wrap property. When a flex-wrap property is set to wrap, items will wrap onto the next line, and the cross axis will become the main axis.

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Advantages of Flexbox

Advantages of Flexbox

Flexbox is a beautiful option for developing modern, innovative, and responsive web designs since it has a lot of advantages over other CSS layout types.

In comparison to other CSS layout methods like float and placement, Flexbox has a number of advantages. Here are a few of the main benefits of utilizing Flexbox.

Flexbox is a beautiful option for developing modern, innovative, and responsive web designs since it has a lot of advantages over other CSS layout types.

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Difference between CSS Grid vs Flexbox

CSS Grid and Flexbox are both CSS layout components, although they perform different functions and have different characteristics. The following are some important distinctions between CSS Grid and Flexbox

Flexbox is best suited for flexible, one-dimensional layouts. whereas  CSS Grid is best suited for complex, two-dimensional layouts, Both modules have advantages and disadvantages, and they can be combined to build even more powerful layouts.

               CSS Grid                  Flexbox
Layout CSS Grid is developed for two-dimensional layout, which allows developers to create complicated layouts with rows and columns. Flexbox is designed for one-dimensional layouts, allowing developers to construct flexible and responsive layouts that adapt to changing screen sizes.
Alignment CSS Grid supports advanced alignment, allowing developers to arrange elements vertically and horizontally. Flexbox is largely intended for aligning things along a single axis, with some limited capabilities for aligning items along a cross-axis.
Order CSS Grid does not support Flexbox allows developers to choose the order in which things display in the layout
Nesting  CSS Grid allows developers to build nested grids, allowing them to design advanced layouts with numerous layers of structure. Nested layouts are not supported by Flexbox.  

Best Practices for Using Flexbox

Practices for using Flexbox

Flexbox is a powerful tool for designing flexible, responsive layouts, but it must be used properly and in accordance with recommended practices. Following these guidelines will allow you to build layouts that are both functional and accessible to all users.

It’s important to remember several practices when using Flexbox. Here are some of them to help you get the most out of Flexbox;

Here are the top 30 objective-type sample CSS Interview questions and answers


Flexbox is an extremely useful tool for simplifying layout design, increasing flexibility, and reducing the need for complex solutions. Flexbox allows you to easily create dynamic and responsive layouts while increasing accessibility and lowering the amount of code required. Flexbox can assist you in creating layouts that are both beautiful and useful, whether you are designing a basic website or a major online application.

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