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CSS @bottom

Introduction to CSS @bottom

CSS Bottom is defined as the bottom property specifies the vertical position of an element added with the position property. It gives the offset at the bottom edge of the reference elements box in any browser windows, which is an element that is altered from the bottom of the viewport. The bottom property does not affect the static position. In this topic, we are going to learn about CSS @bottom.

Syntax and Parameters

The general Syntax is given as:

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.container
{
bottom: value;
}
Value: length |percentage |auto | initial;

Parameters

The parameters define as :

  • length: The value specified in px or em either negative or positive values
  • percentage: This value specifies the percentage of the box element height.
  • auto: It’s a default value. and treat height as a value.
  • inherit: This value inherits its parent container value.

sample example

bottom: 4px         /* length */
bottom: 1.4em
bottom: 20%         / *<percentages */
bottom: auto
bottom: inherit

The element moves away from a given side when a value is assigned positive and negative value moves towards it. For instance, if bottom: -15 px; This sets the paragraph below the bottom edge of a window.

How @bottom works in CSS?

Here Let’s see how this property works by seeing their effect on different positioned elements.

Relatively positioned: When the position is set to this property the bottom adds a respective offset to the bottom edge which moves its position from original form to its top. Generally, a top property overrides the bottom property in many aspects. An offset based on the bottom values is applied to the element itself.

Absolute position: With this, the element would move upwards concerning the nearest parent. To understand this example is given in the next section.

Static: This is the default value and does not affect any element.

In the case of JavaScript, the Syntax given as follows

Object.style.bottom="50px";

Examples

Let’s see how this bottom property works in action with an example:

Example #1

Let’s take an example – effect on the absolute property.

Code:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Example of CSS bottom property</title>
<style>
p {
width: 220px;
position: absolute;
bottom: 100px;
padding: 22px;
font: bold 16px algerian;
background: LightBlue;
}
h1
{
color : red;
}
</style>
</head>
<body>
<h1> Example of Bottom property -CSS </h1>
<p>Bottom Property at the bottom margin of the Page</p>
</body>
</html>

Output:

CSS @bottom output 1

Example #1a

With the same pattern, we can place an image in the bottom property.

Code:

<html>
<head>
<style type="text/css">
img
{
position:absolute;
bottom:0px
}
h1
{
color: aqua;
}
</style>
</head>
<body>
<h1>Bottom property on Image </h1>
<img src="diary.jpg" width="90" height="80" />
<p>This is an image.</p>
</body>
</html>

Output:

CSS @bottom output 1.2

Example #2

With a position set to relative and using value ‘Length’.

Code:

<!DOCTYPE html>
<html>
<head>
<style>
div.square {
width: 12rem;
height: 12rem;
display: flex;
justify-content: center;
align-items: center;
background-color: solid purple;
position: relative;
bottom: 60px;
}
div.outborder {
display: inline-block;
border: 3px dashed yellow;
margin: 30px 0 1 30px;
}
</style>
</head>
<body>
<h1>A Bottom Property with Positioned elements</h1>
<div class="outborder">
<div class="square">
<pre> relative position </pre> </div>
</div>
</body>
</html>

When a bottom is set on the element with respect to the relative position, the element moves up from the original placement of the document. Assigning bottom to 60px it shift its positions to the top.

Output:

CSS @bottom output 2

Example #3

Setting a default value for the bottom property.

Code:

<html>
<head>
<title> Bottom - Demo </title>
</head>
<body>
<h1 style="color:purple;">Welcome to the Home Page</h1>
<p style="position: fixed; bottom: auto; justify-content: center;
align-items: center; border: 3px dashed yellow;
margin: 30px 0 1 30px;">
This property makes a paragraph content to be auto adjusted from the margin of bottom page.
</p>
</body>
</html>

Output:

CSS @bottom output 3

Example #4

Code:

<!DOCTYPE html>
<html>
<head>
<title>
CSS bottom Property- Demo
</title>
<style>
div{
position: relative;
width: 100px;
height: 110px;
font-size: 20px;
}
#length {
bottom: -100px;
border: 4px solid purple;
}
#emvalue {
bottom: -20em;
border: 4px solid aqua;
}
#autovalue {
bottom: auto;
border: 4px solid darkviolet;
}
#initdefault{
bottom: initial;
border: 7px solid yellow ;
}
h1{
text-align: center;
}
</style>
</head>
<body>
<h1> Example of the bottom Property </h1>
<div id = "length"> bottom: -100px; </div>
<div id = "emvalue"> bottom: -15em; </div>
<div id = "autovalue"> bottom: auto; </div>
<div id = "initdefault"> bottom: initial; </div>
</body>
</html>

Output:

output 4

Example #5

An example demonstrating bottom property on the Static element.

Code:

<html>
<style>
.main-b {
position: static;
right: 20px;
bottom: -20px;
background-color: blue;
padding: 12px;
}
.derived-b {
padding: 12px;
background-color: Orange;
}
</style>
<body>
<div class="parent-b">
<div class="derived-b">
inner element.
</div>
<div class="main-b">
the main element.
</div>
<div class="derived-b">
SUb-element.
</div>
</div>
</body>
<html>

The code above shows static in which if I had happened to change the value of the right , bottom we could see the unchanged output.

Output:

output 5

Example #6

Code:

<!DOCTYPE html>
<html>
<head>
<title>CSS bottom property with bottom</title>
<style>
div {
font-family: Algeria;
font-size: 22px;
}
.A {
border: 12px solid yellow;
position: relative;
}
div.abc, div.xyz {
background-color: red;
border: 2px solid orange;
}
div.abc {
bottom: 15%;
position: absolute;
}
div.xyz {
bottom: 0;
position: absolute;
}
</style>
</head>
<body>
<h1><code><b>15% bottom</b></code></h1>
<div class="A">Denmark, country which is located in western Europe with small population and territory which connects North Sea to Baltic Sea. Denmark experiences frequent freeze and snow falls. <div class="abc">This element absolutely positioned.</div>
</div>
<br />
<h1><code><b>0 bottom</b></code></h1>
<div class="A">Denmark, country which is located in western Europe with small population and territory which connects North Sea to Baltic Sea. Denmark experiences frequent freeze and snow falls. <div class="xyz">This element absolutely positioned.</div>
</div>
</body>
</html>

Here we could see a percentage value calculated on the bottom with absolute position. This code has two <div> class with absolute positioning and the bottom value of Abc class is 15 and xyz is zero. In the output, we can see the difference where ‘0’ bottom value places the text on the bottom edge, whereas the 15 % value places the bottom text quite up.

Output:

output 6

Conclusion

Therefore, coming to the end, this CSS article explains how to use the Property called Bottom with their working and examples. Here we have seen a well-organized explanation with a lot of examples of how to use this in CSS. This property along with attributes like left-right helps to display exact positions.

Recommended Articles

This is a guide to CSS @bottom. Here we discuss How @bottom works in CSS along with programming examples. You may also look at the following articles to learn more –

  1. CSS @keyframes
  2. CSS Typography
  3. CSS nowrap
  4. CSS Formatter
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