In my CSS, I need to make the width of a div 100% - 10px. Is this possible? If so, how?
Pretty straight forward and simple.
This is not possible in CSS. You simply can't do any calculations in CSS. You'll have to rely on Javascript for that.
If you absolutely need it to work through CSS only, you should wrap it in a div with a padding.
HTML:
<div class="wrapper">
<div class="inner"></div>
</div>
CSS:
.wrapper {
padding-right: 10px;
}
And here's the fiddle: http://jsfiddle.net/sZvDY/
Use a margin set it to 5px left and right if you want it centered or 10px either side.
Related
I still have problem to well understand how the float property works in CSS. I do apologize because I know this is css basics but I really want to understand that and get a good explanation. I've created an example to show you.
Here is my page :
I just want to resize the second div at the right. When I look at it in the Chrome Developer Tools, I see that this div begins at the top left of the window and not after the red square. I'd like it to begins just after the red square to change the width properly without calculating the size of the square and doing something like
width = square size + width i want
Do you know how this it happens and how to properly resize the width of the second div ?
EDIT: the solution consists in add the float property to the second div too. The explanation is the following : floated elements are removed from the flow, so they don't stack with the non-floated elements.
You need to set float for another div too.
We generally do like below:
html
<div class="float-left">
<p>floated left</p>
</div>
<div class="float-left"><!--- to float next to previous div--->
<p>floated left</p>
</div>
css
.float-left{
float: left;
}
As per your comment:
We do clear the float values because the container contents would never been collapsed.
You need to float the second div.
Heres an example.
<div class="parent-div">
<div class="left">
</div>
<div class="left">
<p>This is the description of the image</p>
</div>
</div>
You need to set
p { display:inline; }
or
div { display:inline; }
since paragraphs and divs are block elements.
http://www.w3.org/TR/CSS2/visuren.html#block-boxes
the reason is that floated elements are removed from the flow, so they don't stack with the non-floated elements. - therefore they don't "take up space" like before. This is why your text div starts at the top left of its container.
from MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/float
The float CSS property specifies that an element should be taken from the normal flow and placed along the left or right side of its container, where text and inline elements will wrap around it. A floating element is one where the computed value of float is not none.
You have to set float for both DIVs
Here is the updated code:
HTML:
<div id="main_container">
<div class="left"></div>
<div class="right">
<p>This is the description of the image <i>Random text</i>
</p>
</div>
<!--Comment below <DIV> to see the result-->
<div class="clear"></div>
</div>
CSS
#main_container {
border:5px solid #000;
}
.left, .right {
width: 100px;
height: 100px;
background: red;
float:left;
}
.right {
background: blue;
width: calc(100% - 100px);
}
.clear {
clear:both;
margin:0;
padding:0;
}
Also, just to add one more important fact related to "float" is, make sure you add "clear:both" property after "float".
Why?? Because, a common problem with float-based layouts is that the floats' container doesn't want to stretch up to accomodate the floats. If you want to add, say, a border around all floats (ie. a border around the container) you'll have to command the browsers somehow to stretch up the container all the way.
Here is the Fiddle for the same: http://jsfiddle.net/1867ud9p/7/
Hope this will help!
I have a 960px wide wrap, and then a 930px wide main-content wrap with 15px left/right margins. within the main-content wrap there are three divs floated left that are each 280px wide, with 15px margin-right to fill the main-content. To avoid giving the div to the right a margin and make it not fit I gave it another class and set its margin-right to 0.
I am trying to make the site responsive and these are my percentage calculations:
wrap=100%
main-content=96.875%
main-content margins=1.5625%
divs=30.10752688%
div margins=1.61290323
CSS:
#page-wrap {
width:960px;
margin: 0 auto;
background: white;
}
#main-content {
width:96.875%;
margin:15px 1.5625% 0 1.5625%;
}
.box { (the divs)
float:left;
width:30.10752688%;
min-height:160px;
margin:30px 1.61290323% 0 0;
}
.right{ (only the div to the right)
margin-right:0;
}
HTML
<div id="page-wrap">
<div id="main-content">
<div class="box">
content
</div>
<div class="box">
content
</div>
<div class="box right">
content
</div>
</div>
</div>
I don't know why the divs dont seem to resize correctly. Any help would be much appreciated!
The site can be viewed here for now: http://hl.kylmark.se
The problem I see is that there's a fixed 10px padding around all of the blue boxes. Since the padding is added on to an element's width, it throws off your percentage math.
Solution 1
You could just change the side padding on those boxes to a percent value like everything else:
.blue {
...
padding: 10px 1.0752688%;
}
With that approach you'd be collapsing the borders as you get smaller, which may not be desirable.
Solution 2
Maybe a better approach is to change the box-sizing property to calculate width from border to border rather than from content edge to content edge. That way you can have a 10px padding inside a flexible container whose width is figured correctly:
.box {
...
width: 32.258065%;
box-sizing: border-box;
}
One more thing
You may also want to watch out for is sub-pixel rounding. When your percentages calculate to something other than a whole pixel, the browser has to decide how to round it. If too many things are rounded up, the widths will get too big and cause content jumps like that in some browsers. You'll want to double-check that in your supported browsers. You can read a good explanation here.
I have the page with the structure:
<div id="container">
<div id="header">top menu</div>
<div id="content">content</div>
<div id ="footer" align="center">
<div class="left">left part of footer menu</div>
<div class="right">right part of footer menu</div>
</div>
</div>
Css style:
#container {
position:relative;
height:auto !important;
height:100%;
min-height:100%;
}
#content {
padding:0em 0em 12em;
}
#footer {
position:absolute;
width:100%;
bottom:0;
}
.left {
float: left;
}
.right {
float: right;
}
That works fine in all browsers. But when I add
<script type="text/javascript"></script>
inside
<div class="left">
in FireFox(only) the part of footer after the script come up to the top - between header and content divs.
What's wrong with it?
UPD
This all was about wrong mark-up inside #content. And only FireFox didn't understand when I missed one of closed table tag:) Thank you guys, you helped me to sort it out.
The #footer has absolute position and is inside the relatively positioned #container div so I would expect this. Maybe try making container absolutley positioned.
Also I think your markup is not what you intended. There are one too many opening div tags.
change the #container height from auto to 100% and remove the extra lines for height.
The auto is messing up the calculations as it overrides the 100% lines due to the !important value
Since #footer's position is absolute, with bottom 0, it will be positioned relative to its first (non statically positioned) parent, which is #container. Essentially what's happening here is that #container is becoming mush less high, and dragging #footer with it.
That's happening because you have two height: settings in the css for #container (somehow the script tag triggers it to refresh) so the behaviour would be undefined.
If you're trying to make the footer stick to the bottom of the window, including as it's resized, I'd advise having a javascript function handle it, triggered by the window's resize event (it's fairly simple, see this question on javascript window resize event
You could try the CSS a different way with absolute positioning. I try and avoid float as it can lead to unexpected rendering issues. See this jsFiddle for an alternate approach. Working in IE6, Chrome12 and FF3.6 and FF4 for me.
Ok here is the site:
http://danberinger.com/
If you view the source for the HTML and CSS you can see that I have set the height of the div in the middle to 100% and given it an overflow property value of hidden, it is called "main_content". I realized that the height value is having no effect on what is displayed, the overflow value of hidden is allowing the background color of the main_content div to extend down to the footer. I guess I am wondering what the best way for me to achieve a variable div height on each page or "main_content" while maintaining the background color. Am I doing this the right way or am I using some kind of css hack that is not the proper way to do it. All insight is welcome. Make sure to take a look at the source HTML and CSS before giving me an answer.
The easiest solution would be to assign the background color to your body element. Something like this:
body {
margin: 0;
padding: 0;
width:100%;
height:100%;
background-color:#cccccc;
}
This will also eliminate the few pixel white border around the edges, if you want to maintain that, take out the margin and padding declarations.
I might have misunderstood what you want, but try this:
Replace div#intro_container with:
div#intro_container {
width:830px;
margin:auto;
overflow: hidden;
background-color:#333333;
}
And remove the height property from div#messagebox.
I prefer to do in this way:
In the content of div 'main-content', add
In your case it was
<div id="main_content">
<div id="navigation">..</div>
<div id="intro_container">..</div>
</div>
It cam be rewritten as
<div id="main_content">
<div id="navigation">..</div>
<div id="intro_container">..</div>
<div style="clear:both"></div>
</div>
AFAIK This is a standard way to achieve what are you doing.
I have a container background defined in CSS like this;
.container {
background:#fff;
margin-left:auto;
margin-right:auto;
position: relative;
width:970px;
border:1px solid #000;
padding:5px 10px;
}
The problem is I have a jqGrid put in the bottom of the container (near the bottom edge) and when its initially drawn it does fit inside the container panel and looks correct. Something like this (please pardon my non-l33t graphic skillz):
alt text http://img67.yfrog.com/img67/7162/screenshot002f.jpg
But then when I populate the grid with rows it outgrows the container and it looks really tacky, something like this (I circled the original container background edges):
alt text http://img80.yfrog.com/img80/5419/screenshot003fr.jpg
I am sure its something I am doing wrong with the CSS. Any advice would be appreciated.
EDIT: The problem isn't the width its the height of the container being overlapped by the new height of the now populated grid
I've seen this happen many times when you have floats inside. Add a clearing div just before closing container. You should always clean up after floats.
<div class="container">
<div id="nav" style="float:left;">
...
</div>
<div id="grid" style="float:left;">
...
</div>
<div style="clear:both;"></div> <!-- this does the trick -->
</div>
I disagree with adding float to container. Although this will work, having unnecessary floats will give you more problems down the road. Only use floats where necessary and clear it when done floating.
Also in my experience, overflow doesn't mean anything here unless you define height. I don't think setting overflow on container fixes the issue here. Correct me in the comments if I'm wrong.
.container { overflow:hidden; }
assuming you are dealing with floats, this is one way to make the container actually contain them.
Your container is fixed width and won't grow. What you're probably looking for is min-width. In other words, change:
width:970px;
to:
min-width:970px;
As a note, IE 6 and 7 treat width as min-width, but other browsers do not.
I think you need this in your CSS:
overflow: auto;
Depending on your float situation for the container and the inside grid, you can do a number of different things. You might be able to get away with just adding a clear,
clear:both;
You also can float the parent. This is called, setting a float to fix a float. So if your grid has a
float:left;
Then you can just add
float:left;
to your container css. I really like the Complex Spiral article on containing floats.