You can apply this CSS to the inner <div>
:
#inner {
width: 50%;
margin: 0 auto;
}
Of course, you don't have to set the width
to 50%
. Any width less than the containing <div>
will work. The margin: 0 auto
is what does the actual centering.
If you are targeting Internet Explorer 8 (and later), it might be better to have this instead:
#inner {
display: table;
margin: 0 auto;
}
It will make the inner element center horizontally and it works without setting a specific width
.
Working example here:
#inner {
display: table;
margin: 0 auto;
border: 1px solid black;
}
#outer {
border: 1px solid red;
width:100%
}
<div id="outer">
<div id="inner">Foo foo</div>
</div>
EDIT
With flexbox
it is very easy to style the div horizontally and vertically centered.
#inner {
border: 1px solid black;
}
#outer {
border: 1px solid red;
width:100%;
display: flex;
justify-content: center;
}
<div id="outer">
<div id="inner">Foo foo</div>
</div>
To align the div vertically centered, use the property align-items: center
.
Basics
For controlling "cellpadding" in CSS, you can simply use padding
on table cells. E.g. for 10px of "cellpadding":
td {
padding: 10px;
}
For "cellspacing", you can apply the border-spacing
CSS property to your table. E.g. for 10px of "cellspacing":
table {
border-spacing: 10px;
border-collapse: separate;
}
This property will even allow separate horizontal and vertical spacing, something you couldn't do with old-school "cellspacing".
Issues in IE ≤ 7
This will work in almost all popular browsers except for Internet Explorer up through Internet Explorer 7, where you're almost out of luck. I say "almost" because these browsers still support the border-collapse
property, which merges the borders of adjoining table cells. If you're trying to eliminate cellspacing (that is, cellspacing="0"
) then border-collapse:collapse
should have the same effect: no space between table cells. This support is buggy, though, as it does not override an existing cellspacing
HTML attribute on the table element.
In short: for non-Internet Explorer 5-7 browsers, border-spacing
handles you. For Internet Explorer, if your situation is just right (you want 0 cellspacing and your table doesn't have it defined already), you can use border-collapse:collapse
.
table {
border-spacing: 0;
border-collapse: collapse;
}
Note: For a great overview of CSS properties that one can apply to tables and for which browsers, see this fantastic Quirksmode page.
Best Answer
Since CSS3 was introduced, the best way to add rounded corners using CSS is by using the
border-radius
property. You can read the spec on the property, or get some useful implementation information on MDN:If you are using a browser that doesn't implement
border-radius
(Chrome pre-v4, Firefox pre-v4, IE8, Opera pre-v10.5, Safari pre-v5), then the links below detail a whole bunch of different approaches. Find one that suits your site and coding style, and go with it.