CSS - Align
A block element is an element that takes up the full width available, and has a line break before and after it.
Examples of block elements:
Block elements can be aligned by setting the left and right margins to "auto".
Note: Using margin:auto will not work in Internet Explorer, unless a !DOCTYPE is declared.
Setting the left and right margins to auto specifies that they should split the available margin equally. The result is a centered element:
Example
.center
{
margin-left:auto;
margin-right:auto;
width:70%;
background-color:#b0e0e6;
}
Tip: Aligning has no effect if the width is 100%.
One method of aligning elements is to use absolute positioning:
Example
.right
{
position:absolute;
right:0px;
width:300px;
background-color:#b0e0e6;
}
Note: Absolute positioned elements are removed from the normal flow, and can overlap elements.
When aligning elements like this, it is always a good idea to predefine margin and padding for the <body> element. This is to avoid visual differences in different browsers.
There is also another problem with IE when using the position property. If a container element (in our case <div class="container">) has a specified width, and the !DOCTYPE declaration is missing, IE will add a 17px margin on the right side. This seems to be space reserved for a scrollbar. Always set the !DOCTYPE declaration when using the position property:
Example
body
{
margin:0;
padding:0;
}
.container
{
position:relative;
width:100%;
}
.right
{
position:absolute;
right:0px;
width:300px;
background-color:#b0e0e6;
One method of aligning elements is to use the float property:
Example
.right
{
float:right;
width:300px;
background-color:#b0e0e6;
