CSSレイアウト-フロートの例
このページには、一般的なフロートの例が含まれています。
ボックスのグリッド/等幅ボックス
ボックス1
ボックス2
ボックス1
ボックス2
ボックス3
このfloatプロパティを使用すると、コンテンツのボックスを簡単に並べて表示できます。
例
* {
box-sizing: border-box;
}
.box {
float: left;
width: 33.33%; /* three
boxes (use 25% for four, and 50% for two, etc) */
padding:
50px; /* if you want space between the images */
}
ボックスサイジングとは何ですか？
3つのフローティングボックスを簡単に並べて作成できます。ただし、各ボックスの幅を拡大するもの（パディングや境界線など）を追加すると、ボックスが壊れます。このbox-sizingプロパティを使用すると、ボックスの全幅（および高さ）にパディングと境界線を含めることができ、パディングがボックスの内側に留まり、壊れないようになります。
ボックスサイズ設定プロパティの詳細については、CSSボックスサイズ設定の章をご覧ください。
画像を並べて
ボックスのグリッドを使用して、画像を並べて表示することもできます。
例
.img-container {
float: left;
width: 33.33%; /* three
containers (use 25% for four, and 50% for two, etc) */
padding:
5px; /* if you want space between the images */
}
等しい高さのボックス
In the previous example, you learned how to float boxes side by side with an equal width. However, it is not easy to create floating boxes with equal heights. A quick fix however, is to set a fixed height, like in the example below:
Box 1
Some content, some content, some content
Box 2
Some content, some content, some content
Some content, some content, some content
Some content, some content, some content
Example
.box {
height: 500px;
}
However, this is not very flexible. It is ok if you can guarantee that the boxes will always have the same amount of content in them. But many times, the content is not the same. If you try the example above on a mobile phone, you will see that the second box's content will be displayed outside of the box. This is where CSS3 Flexbox comes in handy - as it can automatically stretch boxes to be as long as the longest box:
Example
Using Flexbox to create flexible boxes:
Tip: You can read more about the Flexbox Layout Module in our CSS Flexbox Chapter.
Navigation Menu
You can also use float with a list of hyperlinks to create a horizontal menu:
Example
Web Layout Example
It is also common to do entire web layouts using the float property:
Example
.header, .footer {
background-color: grey;
color: white;
padding: 15px;
}
.column {
float: left;
padding: 15px;
}
.clearfix::after {
content:
"";
clear: both;
display: table;
}
.menu {
width: 25%;
}
.content {
width: 75%;
}
More Examples
Let an image float to the right in a paragraph. Add border and margins to the image.
Let an image with a caption float to the right.
Let the first letter of a paragraph float to the left and style the letter.
Use float to create a homepage with a navbar, header, footer, left content and main content.
All CSS Float Properties
| Property | Description |
|---|---|
| box-sizing | Defines how the width and height of an element are calculated: should they include padding and borders, or not |
| clear | Specifies what should happen with the element that is next to a floating element |
| float | Specifies whether an element should float to the left, right, or not at all |
| overflow | Specifies what happens if content overflows an element's box |
| overflow-x | Specifies what to do with the left/right edges of the content if it overflows the element's content area |
| overflow-y | Specifies what to do with the top/bottom edges of the content if it overflows the element's content area |