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5+ Flex 使い方 References

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Introduction

Flexbox, also known as Flexible Box Layout, is a powerful tool that allows developers to create complex layouts with ease. It is a CSS layout module that helps in creating responsive designs and is widely used in web development. In this article, we will discuss the basics of flexbox, its properties, and how to use them to create stunning layouts.

The Basics of Flexbox

Flexbox is based on the concept of flex containers and flex items. A flex container is an element that has the display property set to "flex". It contains one or more flex items, which are the child elements of the container. The main idea behind flexbox is to distribute the available space within a container among its child elements. This is done through the use of flex properties.

Flex Properties

The most commonly used flex properties are "flex-direction", "justify-content", and "align-items". Let's discuss each of these in detail.

Flex-Direction

The "flex-direction" property defines the direction in which the flex items are placed within the container. It can have four values: "row", "row-reverse", "column", and "column-reverse".

Justify-Content

The "justify-content" property determines how the flex items are aligned along the main axis of the container. It can have five values: "flex-start", "flex-end", "center", "space-between", and "space-around".

Align-Items

The "align-items" property determines how the flex items are aligned along the cross-axis of the container. It can have five values: "flex-start", "flex-end", "center", "baseline", and "stretch".

Using Flexbox in Practice

Now that we have discussed the basic properties of flexbox, let's see how we can use them to create layouts.

Creating a Basic Layout

To create a basic layout using flexbox, we first need to define a container element and set its display property to "flex". We can then add child elements to the container and apply flex properties to them. For example, let's say we want to create a layout with two columns. We can create a container element and add two child elements to it, each representing a column.


  
Column 1

  
Column 2

We can then apply flex properties to the container and its child elements to achieve the desired layout.

.container {
  display: flex;
}
.column {
  flex: 1;
}

In this example, we have set the "flex" property of the child elements to "1" to distribute the available space equally between them.

Creating a Responsive Layout

Flexbox is particularly useful for creating responsive layouts, as it allows us to easily change the layout based on the screen size. For example, let's say we want to create a layout with three columns on larger screens and two columns on smaller screens. We can achieve this using media queries and the flex properties.


  
Column 1

  
Column 2

  
Column 3

@media screen and (max-width: 768px) {
  .container {
    display: flex;
    flex-direction: column;
  }
  .column {
    flex: 1;
  }}
@media screen and (min-width: 769px) {
  .container {
    display: flex;
    flex-direction: row;
  }
  .column {
    flex: 1;
  }}

In this example, we have used media queries to change the flex direction of the container and adjust the flex properties of the child elements based on the screen size.

Conclusion

Flexbox is a powerful tool that makes it easy to create complex layouts in web development. By understanding the basic properties of flexbox and how to use them in practice, you can create stunning and responsive designs that work across different screen sizes. With the help of media queries, you can even create layouts that adapt to different devices and screen orientations.

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