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Positioning backgrounds

From: CSS Web Site Design

Video: Positioning backgrounds

As you just saw in the previous video, you can not only place an image in the background of an element, you can also affect the way it repeats, you can have it repeat horizontally, vertically or not repeat at all. Now, what we're going to look at in this video, is how you can effect the placement of that image an we're going to do that with our little no repeated image here, or nonrepeated image up, in the upper left-hand quarter of the content. Let's say a background position top. This is not the end of what we can do, but it's a good place to restart. We hit Reload, the, tadaa! The image goes right into the center of the top of the elements background. If you only have one keyword and this is a keyword top, then it's assumed that the one that you didn't provide is center. So there are five keywords in that position, there're top, bottom, right, left and center. So I could say top center, and that would be exactly the same as just saying top, because if I don't have that second keyword, then center is assumed. If I change this to say right, then the browser would assume that I wanted it in the right center. You can see it's over there on the right edge in the vertical center of the element, not the center of the page.

Positioning backgrounds

As you just saw in the previous video, you can not only place an image in the background of an element, you can also affect the way it repeats, you can have it repeat horizontally, vertically or not repeat at all. Now, what we're going to look at in this video, is how you can effect the placement of that image an we're going to do that with our little no repeated image here, or nonrepeated image up, in the upper left-hand quarter of the content. Let's say a background position top. This is not the end of what we can do, but it's a good place to restart. We hit Reload, the, tadaa! The image goes right into the center of the top of the elements background. If you only have one keyword and this is a keyword top, then it's assumed that the one that you didn't provide is center. So there are five keywords in that position, there're top, bottom, right, left and center. So I could say top center, and that would be exactly the same as just saying top, because if I don't have that second keyword, then center is assumed. If I change this to say right, then the browser would assume that I wanted it in the right center. You can see it's over there on the right edge in the vertical center of the element, not the center of the page.

The center of the element. So our center element is, that's been lined up with the midpoint, the vertical midpoint of that element. OK, now, this is equivalent, this top or top center, can be expressed in different ways. I can say 50% 0. What that means is take this element and put it 50% of the way across the element and 0 down, so don't push it down at all, just put it 50% of the way across and that comes out to be basically top center, 50% and was actually having as the midpoint of that image is lined up with the midpoint of the element and then in the case of zero is just not pushed down at all.

It can be. The thing is that the order matters here. When it comes to numbers, the order matters. With the keywords you can center top or top center, doesn't matter it's still going to end up in that top center area, but with the numbers it's always the horizontal position first and the vertical position second. If I reverse this, I'm saying don't push the background image over at all, but but align it vertically, at the 50% point, and you'll to see that this is going to flip over to the left center. Because, again, with the numbers, the order matters. If I want it top center, I got to say 50% zero. So only if I just set 75%, and I don't provide another number, that's the horizontal position, that's going to place the image three quarters of the way across the element and 50% down. So, 50% being in the mid, vertical midpoint of that element, so you can see there it is, its three quarters of the way across and vertically it's centered, it's up to 50% point because, when I have a number like this, when I just 75% it's assumed that the other number is 50% and since the horizontal always comes first, that means that a vertical 50% is always assumed.

Now we don't have to always stick to percentages, I could say I want this to be 75% of the way across and 50 pixels down from the top. So there, the top edge of that background image is going to be 50 pixels below the top edge of the element and is going to be three quarters of the way across the element. Now the fact that the image bottom happens to line up with the boarder, there that is a total coincidence. If I were to change the text size, then you can see that alignment doesn't actually exist. That's completely an illusion, just happens to have landed there.

Now, where this get's interesting is if we do actual repetition. So suppose I say repeat-x from my background position of 75% 50 pixels. I say repeat along the x-axis and it does. Repeat x doesn't mean repeat right, it actually means repeat in both directions along the x-axis. So from that placement of 75% 50px, which is right where it was before, the image is tiled out horizontally in both directions.

And if I flip it so that I'm actually doing repeat-y instead of repeat-x, and again, from that position, from that placement, it repeats in both directions, both upwards and downwards along the y-axis. There's no such thing as repeat down in CSS. There's only repeat-y and it goes in both directions here. So, why that makes a difference, you can actually see, if I were to say repeat-y top center, that's going to move this so that the origin image, which is the placement of the first image is in the top center, just like we saw before and then it's tiled vertically in both directions.

Bu that means, effectively, it's visually justified to the top of the element background and if I were to change this to le's say just center, then watch over here what it happens when I hit Reload. See how there is that slight change. What's happened now is that this straight is being centered, because the origin image, the first placement is right in the middle of the element and that's repeated in both directions. You get the stripe effectively visually centered within the element background so there's a little bit of, of images, of visible at the top of the element background, a little bit visible at the bottom of the background. So that's why there's a difference in where you position the background image and then you tile it. It is exactly the same thing if we were to do a full on repeat, which we can do if the background position is centered and then we just repeat. The tiling is centered within the element effectively, so no matter how we change the size of the browser window, the pattern always stays centered within the element, whereas if I were to take this back to the let's say top left or 00, which is the default value, then the origin image is going to be the top left corner and no matter how that element changes size, The painting is always anchored to that, background is always anchored to that top left corner. So, there's how background positioning can actually affect the way that the tiling looks in a web browser.

In the next exercise we're going to take a look at how we can bring all this down effectively into a very simple expression.

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This video is part of

Image for CSS Web Site Design
CSS Web Site Design

73 video lessons · 61082 viewers

Eric Meyer
Author

 
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  1. 14m 34s
    1. Welcome
      28s
    2. What is CSS?
      5m 34s
    3. Design tour
      2m 38s
    4. Using the exercise files
      1m 20s
    5. Installing the Web Developer toolbar
      4m 34s
  2. 25m 56s
    1. XHTML essentials
      3m 55s
    2. CSS essentials
      5m 17s
    3. Embedded style sheets
      2m 20s
    4. Linking a style sheet
      2m 19s
    5. Linking to multiple style sheets
      2m 20s
    6. Using linked and embedded style sheets together
      4m 21s
    7. Using imported style sheets
      5m 24s
  3. 57m 48s
    1. ID selector essentials
      6m 38s
    2. Class selector essentials
      4m 9s
    3. Best practices for classes
      4m 52s
    4. Grouped selection
      4m 2s
    5. Descendant selectors
      6m 44s
    6. The sources of style
      6m 38s
    7. Specificity
      8m 21s
    8. Making things important
      4m 32s
    9. Inheritance essentials
      5m 12s
    10. Making things really unstyled
      4m 2s
    11. User style sheets
      2m 38s
  4. 39m 3s
    1. Box model essentials
      7m 35s
    2. Simple floating
      5m 3s
    3. Using float for layout
      5m 5s
    4. Fixing column drop
      5m 35s
    5. Clearing essentials
      4m 20s
    6. Float containment
      6m 35s
    7. Creating a navbar from a list
      4m 50s
  5. 38m 3s
    1. Coloring text
      4m 13s
    2. Defining color in CSS
      8m 12s
    3. Coloring backgrounds
      6m 35s
    4. Applying background images
      4m 19s
    5. Manipulating the direction of background images
      2m 52s
    6. Positioning backgrounds
      7m 23s
    7. Background shorthand
      4m 29s
  6. 58m 28s
    1. Altering line height
      7m 32s
    2. Font style and weight
      5m 45s
    3. Sizing fonts
      9m 59s
    4. Using font families
      10m 38s
    5. Font shorthand
      6m 5s
    6. Justifying text
      4m 56s
    7. Vertically aligning text
      4m 22s
    8. Transforming text
      3m 49s
    9. Text decoration
      5m 22s
  7. 44m 40s
    1. Margin essentials
      14m 21s
    2. Adding borders
      6m 52s
    3. Padding
      9m 17s
    4. Using negative margins
      7m 19s
    5. Margin collapsing
      6m 51s
  8. 20m 38s
    1. Styling tables and captions
      5m 23s
    2. Styling table cells
      6m 30s
    3. Styling a column with classes
      4m 51s
    4. Styling links inside table cells
      3m 54s
  9. 30m 40s
    1. Styling for specific mediums
      4m 3s
    2. Creating a print style sheet
      6m 35s
    3. Hiding layout for print
      4m 11s
    4. Styling for print
      6m 34s
    5. Complex styling for print
      4m 37s
    6. Creating a footer
      4m 40s
  10. 37m 23s
    1. Getting started
      1m 11s
    2. Setting global styles
      4m 4s
    3. Defining masthead and navbar colors
      3m 27s
    4. Layout of the navlink bar
      3m 38s
    5. Using columns
      4m 49s
    6. Setting content styles
      1m 53s
    7. Creating the sidebar boxes
      5m 42s
    8. Creating the sidebar form
      3m 23s
    9. Completing the sidebar
      3m 29s
    10. Making a table
      3m 12s
    11. Creating a footer
      2m 35s
  11. 1m 28s
    1. Goodbye
      1m 28s

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