Flexbox is a super-efficient layout module that was introduced in CSS3.

It aims at providing a more efficient way to layout, align and distribute space among items in a container, even when their size is unknown or dynamic.

Flexbox is a whole module and not a single property, it involves a lot of terminologies including its whole set of properties.

We call the parent container --> Flex Container & the children -->Flex Items

There are 2 sets of Flexbox properties:

• Properties for Flex container ( Parent Container )
• Properties for Flex items ( Children )

But for this article, we would be discussing only Flex container ( Parent Container ) Properties. Let me know if you like this article and want the 2nd part of it.

Let's get started!

Flex Container Properties:

• Display:

  .container { display: flex; }

This defines the .container to be a Flex Container. And It enables a flex context for all its direct children. This property is needed if you are looking forward to using other flexbox properties.

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• Flex Direction :

  .container { flex-direction: row | row-reverse | column | column-reverse; }

Basically the flex-direction property aligns the flex-children in either Rows or Columns. The property flex-direction can have 4 values : row, row-resverse, column & column-reverse.

The images below will help you understand each of the above values visually.

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• Flex Wrap :

  .container { flex-wrap: nowrap | wrap | wrap-reverse; }

So, by default, the flex items will all try to fit onto one line. We can alter this behaviour with the flex-wrap property.

• nowrap (default) : All flex items will be on one line, no matter what.
• wrap: Flex items will wrap onto multiple lines, from top to bottom, if needed.
• wrap-reverse: Flex items will wrap onto multiple lines from bottom to top if needed.

flex-wrap would align the flex-children on multiple lines provided flex-children have width defined, making it super easy to achieve responsiveness to quite some extent.

I personally feel that flex-wrap is one of the best things Flexbox offers.

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• Flex Flow :

  .container { flex-flow: row nowrap; }

This is a shorthand for the flex-direction and flex-wrap properties. The default value is row nowrap. Using the property more often is recommended as it avoids writing more lines of code, keep your code short and clean.

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• Justify Content :

  .container { justify-content: flex-start | flex-end | center | space-between | space-around | space-evenly }

justify-content is used for Horizontal Alignment of Flex-Items. It helps distribute the extra free space over all the flex items. This one of the most used Flexbox properties.

• flex-start (default): Items are aligned towards the start of the flex-direction.
• flex-end: Items are aligned toward the end of the flex-direction.
• center: Items are centred on a horizontal axis.
• space-between: Items are distributed such that the first and the last items are at extreme end other items in the middle are placed at equal distance from each other.
• space-around : Items are evenly distributed in the line with equal space around them except the extreme items.
• space-evenly : The items and the empty space is evenly distributed such that the space between any two items is equal.

These images would illustrate the above values more clearly.

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• Align Items:

  .container { align-items: stretch | flex-start | flex-end | center | baseline }

This property helps us align flex-items vertically. It is just like justify-content, but does things along the vertical axis (cross-axis).

• stretch (default): Items stretch to fill the container.
• flex-start: Items are placed at the top of the parent container.
• flex-end: Items are placed at the bottom of the parent container.
• center: Items are centered vertically.
• baseline: items are aligned such as their text baselines align.

Here are images that explain better.

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PS : justify-content and align-items are some of the the most used flex properties and you can use them to center a div! 😂. Jokes aside, initially these two properties confuse a lot and we end up spending plenty of time choosing the right property for a specific job.

Rule of thumb here is:

• justify-content : Horizontal Alignment.
• align-items : Vertical Alignment.

Here's an image for visual understanding.

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That's it from my side today. Let me know in the comment section if you liked the article. Also, tell me if you would like to read more about flexbox in Part-2 of this article.

Hope you enjoyed it, and if you did consider supporting me 👇