I'm trying to brush up on my HTML and CSS again and I was trying to make a simple layout. Here is the HTML/CSS for my simple site.
<!DOCTYPE html>
<HTML>
<HEAD>
<TITLE>My website</TITLE>
<META CHARSET="UTF-8">
<style type="text/css">
* {
padding: 0px;
margin: 0px
}
html, body {
margin:0;
padding:0;
height:100%;
border: 0px;
}
#TopBar {
width:100%;
height:15%;
border-bottom:5px solid;
border-color:#B30000;
}
#MidBar {
background-color:black;
height:70%;
width:70%;
margin-left:auto;
margin-right:auto;
}
#BottomBar {
position:absolute;
bottom:0;
width:100%;
height:15%;
border-top:5px solid;
border-color:#B30000;
}
h1 {
font-family: sans-serif;
font-size: 24pt;
}
#HEADER {
text-align:center;
}
li {
display:inline;
}
#copyright {
text-align: center;
}
</style>
</HEAD>
<BODY>
<DIV ID="TopBar">
<DIV ID="HEADER">
<HEADER>
<H1>My website</H1>
<NAV>
<UL>
<LI>About me
<LI>Contact me
<LI>My blog
<LI>My portfolio
</UL>
</NAV>
</HEADER>
</DIV>
</DIV>
<DIV ID="MidBar">
<DIV ID="PhotoSlideshow">
test
</DIV>
</DIV>
<DIV ID="BottomBar">
<FOOTER>
<P ID="copyright">Name here ©
<?PHP DATE("Y") ECHO ?> </P>
</FOOTER>
</DIV>
</BODY>
</HTML>
Given the heights I've applied to my div elements I expected everything to line up nicely however it appears that the bottom div is higher than the intended 15% and overlaps onto the middle div, see here demonstrated by the red border at the bottom...
Where am I going wrong? I'm sure it's something simple.
You should understand how the box model works... You are using borders which are counted outside the element, so for example if your element is 200px in height, and has a 5px border, the total element size will be 210px;
So considering this as the concept, what you are having elements which sums up to 100%, and you are using borders too, so that is exceeding the viewport which will result in vertical scroll...
Also you don't have to use position: absolute;, you are making it absolute, just to avoid scrolls but that's a wrong approach. Absolute element is out of the document flow, and will give weird results if you didn't wrapped inside a position: relative; element.
Demo
Few Tips :
Use lowercase tags
Avoid Uppercase ID's unless required
Using 100% vertically is very rare, designers generally use width: 100%; for making the layouts responsive. So if you don't have any specific reason to go for 100% vertical elements, don't go for it..
Solution:
Still if you want to stick with the vertical layout spanning to 100% in height, you should use box-sizing: border-box; property...
What box-sizing will do here?
Well, using the above property, it will change the default behavior of the box-model, so instead of counting the borders, paddings etc outside the element, it will count inside it, thus it will prevent the viewport to be scrolled.
I will provide you an example, which I had made for another answer.
Demo 2 (Updated, had forgot to normalize the CSS)
Explanation for the above demo, if you look at the CSS, I am using
* {
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
box-sizing: border-box;
}
which will make every element paddings, borders etc to be counted inside the element and not outside, if you mark, am using a border of 5px; and still, the window won't get a scroll bar as the border is counted inside the element and not outside.
There are many things a bit off with your code, however the straight forward answer is that borders are part of the box model, therefore part of the height calculation. So the height of your div is 15% of the height + the width of your borders, thus it is oversized.
Please see this explanation of the box model:
http://css-tricks.com/the-css-box-model/
I think it has to do with your borders (each of which is 5px). Since you have your TopBar, MidBar, and BottomBar have percentage heights that add up to %100, WITH additional borders, you have a problem of having an effective height of greater than %100, and then, because you have BottomBar with an absolute position at the bottom, it doesn't force the page to scroll, but simple induces some overlap between the MidBar and BotomBar divs.
Remove "Position: absolute" from: #BottomBar. That should do the trick.
Related
I'm working with divs and I managed to make the wrapper center by having this css:
.wrapper{
margin-left:auto;
margin-right:auto;
margin-top:0;
margin-bottom:0;
width:1100px;
height:100%;
}
then I have this inside that is floated left. It went inside but my problem is when it gets longer, it pass the wrapper div. The wrapper div should also adjust when the height of the div inside adjust but it's not working. When I also float the wrapper, it also adjusts but it doesn't go to the center anymore.
.inside_div{
float:left;
margin:5px;
width:400px;
height:100%;
}
What I tried to do is to float the wrapper div and use:
margin-left:200px;
to adjust it and to make it look that it's in the center. But I based it on my laptop's screen. It may not be centered on different screens with different sizes.
What I wanted to see is that the wrapper div will be centered in all screens and it will also adjust when the div inside adjusts too. I just don't know how to do it.I tried dfferent ways but still same result.
This is the html part:
<html>
<head>
<link href="style.css" rel="stylesheet" type="text/css" media="screen" />
</head>
<body>
<div class="header">
<div class="logo">
</div>
<div class="menu">
</div>
</div>
<div class="wrapper">
<div class="inside_div">
</div>
<div class="inside_div2">
</div>
</div>
<div class="footer">
</div>
</body>
</html>
The inside_div2 is floated right.
Floated objects won't expand their parents. Your initial css height value is all that the parent container has to reference for its height. By the way, height:100% is generally not going to work for you and is rarely something you should include.
Without seeing exactly what you're trying to do, this would probably work fine. Although it depends a bit what you have inside the 'inside_div':
.wrapper {
margin: 0 auto;
width: 1100px;
text-align: left;
}
.inside_div {
display: inline-block;
margin: 5px;
width: 400px;
}
I assume you wanted it off to the left since you were floating it left. But if you just want it centered, you can either just remove your float value and use margin: 0 auto; or use the css above and change text-align to center.
EDIT: Ok, so had to recheck your stuff above. I think what you want is simply this:
.wrapper {
width: 1100px;
margin: 0 auto;
}
.inside_div {
width: 400px;
margin: 0 auto;
}
That'll center both of them, regardless of the size of the screen. You can add a height value to the inside_div if you need, but px values would be best, and if you have content in there is usually best just to let the content dictate the height without explicitly setting it.
Remove all height properties and add a "clearfix" class to your wrapper.
In your css, define ".clearfix" as :
.clearfix:before,
.clearfix:after {
content: " ";
display: table;
}
.clearfix:after {
clear: both;
}
That should do the trick for modern browsers. You should definitely Google "clearfix" to learn more about it.
I am trying to wrap a div called content with another div that has a different background.
However, when using "margin-top" with the content div, it seems like the wrapping DIV gets the margin-top instead of the content div.
Code:
<!DOCTYPE html>
<html>
<head>
<style>
html {
background-color:red;
}
#container-top {
background-color: #ccc;
overflow: hidden;
padding-top: 10px;
border-bottom: 1px solid #000;
height:30px;
}
#container-bottom {
background-color: #F1F4F2;
}
#content {
margin-top:20px;
}
</style>
</head>
<body>
<div id="container-top">
</div>
<div id="container-bottom">
<div id="content">
Hello
</div>
</div>
</body>
</html>
So in the example, the div container-bottom gets the margin-top instead of the content div.
I found out that if I add a char inside container-bottom it fixes the issue.
<div id="container-bottom">
**A**
<div id="content">
Hello
</div>
But of course that is not a good solution...
Thanks,
Joel
What's happening is called margin-collapsing.
If two margins (top & bottom only, not right or left) of 2 elements are touching (or in your case, the top-margin of the inner div is touching the top-margin of the outer div), the max between them is used (in your case max(0, 20) = 20) and placed as far as possible from the touching elements (in your case outside the container div (the outermost element)).
To break this behavior, you have to place something between the 2 margins -> a padding at the top of the container div will do.
#container-bottom {
background-color: #F1F4F2;
padding-top: 1px;
}
#content {
margin-top:19px;
}
other solution (works, but may not suit your needs):
you can simply put a padding-top of 20 px in the container div:
#container-bottom {
background-color: #F1F4F2;
padding-top: 20px;
}
#content {
}
for more informations, this page explains it very well: Margin Collapsing
You could try adding a non-breaking space to the #container-bottom:
<div id="container-bottom">
<div id="content">
Hello
</div>
</div>
This is a suitable solution as it is often used to let a browser know that an element is not empty (some browsers ignore empty elements).
Margin-top is a mysterious creature because of its collapsing properties. I have found the easiest fix to this problem is to apply a 1px padding-top to the container-bottom div and change the content margin-top to 19px.
For example, if you look at Facebook, they have a short blue bar on top that extends the entire width of the browser. I thought about using width:100%; but I know that it needs to have a parent element to be able to do that.
One way:
<div style="position:absolute;left:0px;right:0px;height:20px"> </div>
The document itself acts as a parent element. Divs, by default, are 100% of their parent's width.
What you probably need to do is set no margin or padding on the body element.
<html>
<style>
body { margin: 0; padding: 0; }
#strip { background: #89f; padding: 5px; }
</style>
<body>
<div id="strip">This is a nav strip</div>
</body>
</html>
Demo at http://www.coffeepowered.net/projects/navstrip.html
If you use a CSS reset, then this should Just Work.
Consider the next code:
#container {
width:500px;
}
#inside {
padding:10px;
width:100%;
}
If I choose width:100%; will it be the same as stating "width 480:px" (that is, calculating the padding already) or will it be as "width:500px"
Thanks
Joel
It will be like width:500px and adding the padding it will push the insides of overflow the #container..
But if #inside is a block element, then just giving the padding will make it behave as if it were width:480px
Example at http://www.jsfiddle.net/uA9LV/
It will be the same width as the parent container provided it's a block level element. So #inside will be 500px wide with 10px of padding on every side.
I put this in a sample document and the container div only resized 3 sides (left, top, and bottom).. and the inside div pushed it's boundaries outside of the container by 20px to the right.
I tested in IE8, Firefox 3.6.10, and the latest Chrome. Using various doctypes had no effect.
The code I used was:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Untitled</title>
<style>
#container {
width:500px;
border: solid 1px blue;
}
#inside {
padding:10px;
width:100%;
border: solid 1px red;
}
</style>
</head>
<body>
<div id="container">
<div id="inside">
Hello World!
</div>
</div>
</body>
</html>
Note: if you remove the Width declaration from the #inside div then you'll get exactly what you want. Which is an inner div that is 480px in width + 10px on each side for padding. See this link for more information on it: Solving the CSS Padding problem.
Hi I have a container which has a width of 1150px. Now I have this other mainmenu, with width: 100% that I want to place inside the container. But then ofcourse it only get 100%(1150px) but I want it full width from side to side, so it should ignore the setted width only for .mainmenu
I tried position: absolute which made it all wrong and weird
#mainmenu
{
height: 37px;
width: 100%;
margin: 0px auto;
background-image: url(../images/mainmenu_bg5.jpg);
}
Why is the menu in the container in the first place? If you want the menu to span the full width yet the contents of the container are only 1150px I think it is by definition not right to put the menu in the container. Consider restructuring your document. This is an example, I do not have your full code:
<body>
<div id="page">
<div id="header" style="background:Blue;">
header header header
</div>
<div id="mainmenu" style="background:Green;">
menu menu menu menu
</div>
<div id="container" style="width:1150px;margin:auto;background:Red;">
container container container
</div>
</div>
</body>
And if you want the contents of the header and menu to span no farther than 1150px which I think is what you want then consider this:
<head>
<style type="text/css">
.pagewidth {
width: 1150px;
margin: auto;
}
</style>
</head>
<body>
<div id="page">
<div id="header" style="background:Blue;">
<div class="pagewidth">
header header header
</div>
</div>
<div id="mainmenu" style="background:Green;">
<div class="pagewidth">
menu menu menu menu
</div>
</div>
<div id="container" class="pagewidth" style="background:Red;">
container container container
</div>
</div>
</body>
If your container is fixed-width, but you want a menu which has a background at full page-width, then you can have the menu background as a positioned background of html, and maintain the same HTML code. This will make the menu's background "bar" cover the whole page width.
Example of this method: http://templates.arcsin.se/demo/freshmade-software-website-template/index.html
How to do this: use positioned backgrounds:
http://www.w3schools.com/css/pr_background-position.asp
css is below, but sometime it depend from the content inside:
#mainmenu
{
height: 37px;
width: 100%;
margin: 0px;
position: relative;
background-image: url(../images/mainmenu_bg5.jpg);
}
This is a jQuery solution:
$('#mainmenu').width() == $('#container').width();
To get a background image to simulate the menubar spanning the entire width of the page you need to apply the #mainmenu background to the body or a container div like so:
body {
background: url(YOURIMAGE) repeat-x left 64px;
}
The 64px needs to be how far the #mainmenu is from the top.
If the body already has a background image then you will need another div just inside the body containing everything else. If you have no control over the HTML then using javascript to insert a div that will either wrap all the content or get rendered behind it (using position and z-index.)
position:absolute is the best way to get this while keeping the background in #mainmenu. In fact, it's the only one I can think of off the top of my head. Without javascript, of course. Everything else will require changing HTML or moving the background property to a different place.
#mainmenu
{
position:absolute;
left:0;top:??px;
width:100%;
height:37px;
background-image: url(../images/mainmenu_bg5.jpg);
}
Because #mainmenu's width:100% then will become 100% of the viewport rather than the containing block. (Unless a parent is position:relative or overflow:hidden)
So when you say it "got all weird", I assume that's because of other things on the page. Both absolute and float take items out of the normal document flow. So things below the menu can & will end up underneath it.
#mainmenu
{
position:absolute;
left:0;top:??px;
width:100%;
height:37px;
background-image: url(../images/mainmenu_bg5.jpg);
}
#mainmenu + *
{
padding-top:37px;
}
/* Exact selector not recommended due to poor browser support */
The solution to that is, basically, applying 37px of margin or padding to the first thing after #mainmenu. You'll also be unable to center absolutely positioned elements using margin:0 auto, but if you want it spanning the full width of the viewport, that shouldn't be a concern...If you want to center the live sections of the menu, of course, you'll need some sort of descendant to center:
#mainmenu
{
position:absolute;
left:0;top:??px;
width:100%;
height:37px;
background-image: url(../images/mainmenu_bg5.jpg);
}
#mainmenu > *
{
margin:0 auto;
}
/* Exact selector not recommended due to poor browser support */
/* & more properties needed if descendant is list with floated <li>s */
#mainmenu + *
{
padding-top:37px;
}
/* Exact selector not recommended due to poor browser support */
But there are lots of things you'll see change in relation to other things on the page with position:absolute. So to troubleshoot that I really need to know more about the other things on the page.
You may find another solution, but if you don't -- post a page I can look at & I may be able to help you with the weirdness you experienced with absolute positioning. That is, if it will work with this particular layout.