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How to use the bottom attribute in CSS

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Feb 26, 2024 pm 09:12 PM

cssabsolute positioningrelative positioning

How to use the bottom attribute in CSS

The bottom property in CSS is used to set the bottom edge position of an element relative to its parent element. By adjusting the value of the bottom attribute, you can change the vertical position of the element. The following will introduce the role and usage of the bottom attribute in detail, and provide some code examples to illustrate.

The role of the bottom attribute
The bottom attribute is used to position the element relative to the bottom edge of its parent element. It is one of the positioning properties in CSS. Using the bottom attribute allows the element to move along the bottom edge in the vertical direction without affecting the size of the element itself.
How to use the bottom attribute
The value of the bottom attribute can be a specific pixel value or percentage value, or it can be auto or inherit.

Using pixel values
You can use pixel values to specify the distance of an element from the bottom edge of the parent element. For example, the following code positions an element 100 pixels from the bottom edge of its parent element:
```
.element {
position: absolute;
bottom: 100px;
}
```
Using percentage values
In addition to using pixel values, you can also use percentage values to set elements The distance from the bottom edge of the parent element. Percentage values are calculated relative to the height of the parent element. For example, the following code sets the distance of the element from the bottom edge of the parent element to 50% of the height of the parent element:
```
.element {
position: absolute;
bottom: 50%;
}
```
Using auto and inherit
auto is the default value of the bottom attribute, indicating that the element Layout will follow normal document flow. If you want to reset the bottom property to its default value, you can use auto.

inherit means that the element will inherit the bottom attribute value of the parent element. For example, the following code sets the element's bottom attribute value to inherit the bottom attribute value of the parent element:

.parent {
  position: relative;
  bottom: 100px;
}

.child {
  position: absolute;
  bottom: inherit;
}

Code Example
Here is a complete code example that shows how to use bottom property to position the bottom edge of an element:
```
<!DOCTYPE html>
<html>
<head>
  <style>
 .container {
   position: relative;
   width: 300px;
   height: 300px;
   background-color: gray;
 }
 
 .element {
   position: absolute;
   bottom: 20px;
   width: 100px;
   height: 100px;
   background-color: red;
 }
  </style>
</head>
<body>
  <div class="container">
 <div class="element"></div>
  </div>
</body>
</html>
```
In the above example, a container element is created and set to relative positioning. Then create an element inside the container and use absolute positioning, setting the bottom property to 20px, so that the element is 20 pixels away from the bottom edge of the container.

By reading this article, we understand the role and use of the bottom attribute in CSS, and provide some code examples to illustrate. By using the bottom attribute, we can flexibly adjust the position of the element in the vertical direction, making the page layout more free.

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