Newbie question here. I have a #wrapper as my main container. Like so:
#wrapper {
margin: 0 auto;
padding: 0 20px;
width: 960px;
height: 100px;
}
My question is: what is the actual width of the wrapper now? 960px or 1000px? Let's say I want to have a #header inside the #wrapper. What should the width of my #header be, assuming I want it to be the width of the #wrapper?
The width of the wrapper in your example is now 1000px. Padding is added to the width, wheras Margin is not.
If you put a header inside the wrapper, you would want it to be 1000px to stretch entirely from side to side, but that would be impossible because of the padding, so your header would still have to be 960px.
Heres a JSFiddle (Sorry, just discovered this today!)
http://jsfiddle.net/wGYfR/8/
The outer width is 1000px and the inner width is 960px. So if you want to put inside the wrapper it should have width <= 960px
The wrapper is still 960px. However, you have added padding of 20px on both sides meaning for 20px on both sides there will be only white space. The usable area is now 920px.
You don't have to set the width of the header. If you don't it will fill the whole wrapper element (minus the padding). You header will end up being 920px.
I suggest firebug This will help you so much. Seriously.
The actual width would still be 1000px. You can set a background color on your #wrapper to see that the width will still be 1000px.
CSS Box Model Illustration http://img405.imageshack.us/img405/3402/boxmodel.png
If you use Chrome or Safari (or firebug with Firefox for that matter) you can easily check out the width of an element, and how padding and margin in affecting it.
The width should be 960px, however only FireFox adds the padding to the width.
To fix this, put the following code on top (or at least above all div selectors) of your code:
DIV { /*let Firefox stick to the web standard concerning padding*/
-moz-box-sizing:border-box;
box-sizing:border-box;
margin:0;
padding:0;
}
Related
Please see example at
http://jsfiddle.net/cne94hw4/
.a{
width: 100%;
background-color: #eee;
margin-left: 200px;
}
I was expecting "width 100%" will mean 100% of the windows, but clearly it's not when I add a margin to it. I found this is difficult to understand.
What's the exact relationship of the box and the margin? It's there any written rule for this?
Your question is about the CSS Box model, which is described in detail at the CSS specification: http://www.w3.org/TR/CSS2/box.html
In brief, the width defines the width of the content box. If you add padding, borders
and margins, then the overall width of the block box is the width of the content box plus
any widths due to padding, borders and margins.
As for the height, padding and border widths are added to the overall heigth of the
block. Margins, though, can collapse with the margins of adjacent blocks, which is
another topic to look at (see: collapsing margins).
Another concept is the block formatting context, which comes into play if you
deal with elements that may be floated or positioned.
In your example, the overall width of the a element is 100% plus 200px due to the
left margin.
Finally, you can have some control over how the width is computed by using the box-sizing property.
width: 100%' does mean100%` of the document your example, but you also set a margin, which is what's limiting the width of the element. See what happens when you remove it.
try the following
.class{
width:100%;
padding-left:200px;
box-sizing:border-box;
}
margin adds extra space out of the box.
I am trying trying to make a div's width as wide as it's content. Here's a fidle to show what I mean:
http://jsfiddle.net/djxpU/
I want the blue area to be as wide as the white. I tried float:left and display:inline-block, however they won't work with position:absolute;. Any workarounds?
If you want the white area to fit the blue parent, you'd set the width of the white to 100% #X{
width:100%;
}
Block-level elements actually do this naturally. The problem you have is, absolute positioned elements are taken out of the normal flow, so the block can't wrap around your white boxes.
Is there a reason you need them positioned absolute?
EDIT: If you just wanted the white boxes to be centered, here you go: http://jsfiddle.net/Marconius/djxpU/1/
Code (because I have to): margin: 0 auto;
By default a div will be the width of its parent and will display as block. Here is an example of the divs filling the available space while still maintaining the left margin.
Apply this to your 'X' divs: { margin-left: 120px; height: 40px; background-color: white;}
http://jsfiddle.net/yz3Dk/
On this page, I want the main content div - which has an id value of container - to be horizontally centred on the grey background. However I want the black login panel to remain stretch across the entire width of the screen.
In an effort to achieve this, I added the rule:
#container {
margin: 0 auto;
}
But it doesn't work, what am I doing wrong?
Update
Thanks for the answers. It was suggested that I fix the problem by removing the max-width from the body and setting a width on the container.
This centres the container, but causes it to occupy all the available horizontal space. What I want is for the container to be centred with a width of (say) 900px, and the grey background should appear in the "empty" space on the left and right of the container.
you need to specify a width, otherwise the margin won't know how to centre...
like this:
#container {
width: 960px;
margin: 0 auto;
}
EDIT:
Also, remove the max-width on your body!!
The issue is that you have max-width: 960px; on your body element. Non-absolute elements will not size past the boundaries of their parent element.
You should instead be setting max-width (or better width) on the #container element, otherwise the div will automatically size to 100% as it is a block-level element.
I've been working on http://healthimpactnews.com and I need to fix this issue asap.
For some reason, IE, and IE only, squeezes the right-hand sidebar down below the other divs even though all the div columns are floating and within a fixed width container. My browsers create a horizontal scroll bar when the are sized down, but IE just forces the div down, instead.
Anyone know why?
The div with class ct_w is 1000px width;
The first child of that (ct) is also 1000px width,
so it pushes the second child ct_c3 (the right bar) away... (down)
solution:
completely remove the width property of the div with class ct
.ct {
margin: 0px auto;
width: 1000px; /** <--- remove this **/
}
Yes, your container, "ct_w", has a width of 1000px; your left column, "ct" also has a width of 1000px. There is no room left there for your sidebar, "ct_c3". The other browsers are actually being nice by rendering the sidebar where it is. In fact, they're only doing that because you didn't clear your floats, so they don't understand the box model of ct_w.
Use a clearfix on ct_w, set the width of ct to 750px (or 749px for IE7), and make ct float left, then you will see the layout you're looking for.
Try setting the following:
.ct_w {
...
float: left;
width: 750px;
...
}
.ct_c3 {
...
float: right;
...
}
The following seems to work as well:
.ct
{
float:left;
width:750px;
}
And remove the margin part, because it is not needed when floating the toolbar next to it.
I have a wrapper div with a max width of 700px and the only content is an right-aligned image of less than 700px width. Since it doesn't fill it, the wrapper doesn't expand to 700px. How can I make the wrapper expand to the full width when there is space in the browser window? The only hack I have found so far is to also include a zero height span with more than one line of text in...
A div should by default expand horizontally to the width of it's parent object. Try setting a width on the div to 700px.
As CRasco mentioned, a Div will normally expand to fill its container, until we come along with some fancy style and screw that up. Here are the styles I can think of off the top of my head that will prevent a Div from expanding to fill its container:
These will make it the smallest size needed to hold its contents.
float: left;
float: right;
display: inline;
display: inline-block;
And, of course, any of these would set or restrict the size of the Div. I'm betting you'd have noticed if these were causing your problem, but I thought I should include them to be as complete as possible.
width: 100px;
max-width: 100px;
height: 100px;
max-height: 100px;
You can set overflow: hidden on the 700px div, assuming that you are not setting an explicit height.
If you know the with of the image you could add a margin to it.