Python for Entrepreneurs Transcripts
Chapter: Web design foundations
Lecture: CSS: Layout Demo
0:01 Here we are in PyCharm again, with our little demo app,
0:03 and notice we are in the layout template here,
0:06 and we have an extremely simple set of content in our body,
0:09 it's just an ordered list, with five list items, each of which is a URL.
0:14 So let's take a look at this and see how we can play with the layout
0:18 to change how this stuff appears on the screen,
0:20 and just a way to have something practical
0:22 we are going to create this navigational-like thing.
0:26 All right, so let's run this, see where we are starting from.
0:30 All right, so you saw this picture in the introduction,
0:33 and here we just have these items,
0:35 you can there is really not much going on and it's really just this ordered list, OK.
0:41 The other thing we want to observe is we want to include in this layout.css
0:44 and of course we are using our cache_id thing so we don't have to worry about that.
0:48 Right, now if we look over here, this just says: "Make the fonts big,
0:51 and put no spacing or no padding in the body."
0:55 So we're here in our layout page,
0:58 so what we want to do is we want to target the LIs that are in this ordered list,
1:02 so let's go and work at that first.
1:05 The first thing we want to do realize that these are display block,
1:08 I think they are actually something like list display or list items,
1:11 or something like that but effectively, they take up a whole screen, if I come over
1:15 and I say, let's just try to highlight them for a minute,
1:20 so we say like background color is yellow,
1:23 just make it something totally obvious that will stand out,
1:26 you can see they more or less take up the entire width,
1:28 other than their little number there.
1:30 What we want to do is tell them: "Don't take up the whole thing,
1:33 just take up as much space as you need to."
1:35 So we can come down here and say "display", this is basically the CSS command
1:39 or CSS property that we are going to focus on for this demo is the "display".
1:43 So, there is things like "block" and there is this list item which is out,
1:48 it's actually displayed right now but it's also behaving more like a block if you will.
1:52 What we want to do is say look,
1:55 we'd still like to apply the box model to these list items,
1:57 but we want them to flow, kind of like words in HTML do,
2:01 and the word wrap and not taking new lines on their own
2:03 just sort of take however space they need.
2:05 So we can do that by just setting them to inline-block.
2:08 Now if I run it, you can see OK, this looks more interesting, this looks different,
2:13 now let's go over here and let's set this to be
2:17 my favorite dark color #222 and run it again,
2:21 this is all right, we'd like to set the color here
2:24 and this is something that you'll see that's a little bit funky in CSS.
2:27 Sometimes you try to set the color and what these are, are actually are hyperlinks,
2:31 and so I can come down here and I can say: "You know what,
2:34 I want the color of everything in there to be let's say white,
2:38 OK." And nothing happens.
2:40 The reason nothing happens is we are not,
2:42 the anchors actually have a stronger color setting than just the list item.
2:49 So, we want to set for all the anchors that are contained within the list item
2:53 we want to set their color, so we'll set this to be color.
3:02 Now if we run it, now it's starting to get white, and notice, if we hover over it,
3:06 we are still getting this little color, like,
3:09 so there is three color settings for anchors, or hyperlinks, one is the main color,
3:15 the next one is what happens when you hover over it
3:18 and the third is what happens when you click it, while it's loading the next page,
3:22 so these are what are called pseudo classes, or pseudo property,
3:26 so the hyperlink we come over here and we hit ":" and this really works for anything,
3:30 we could say hover and set this pseudo property because of the colon here,
3:35 and here we can set it to be, let's set this to be like kind of a gray,
3:39 so let's say "aaa" to make it kind of obvious,
3:42 darker when we hover, notice because we said this hover pseudo property
3:48 now we have this color is white, let's also set the text decoration to none,
3:52 by default the text decoration is underlined, so now just like this,
3:58 all right, we are getting in there, we've set the display to inline-block
4:01 to get this to float across the top, we've tweaked our colors a little bit,
4:04 now it turns out we are actually coloring the wrong thing,
4:06 I set the color like that so you could really clearly see the list items
4:10 but the thing that we really want to set is the ordered list,
4:14 I want to set its background color and if we leave these alone
4:17 it will just inherit from whatever is contained within, now I try this again,
4:21 here we go, we are starting to get somewhere,
4:24 OK, it's starting to look like navigation,
4:28 and let's maybe put a little bit of padding,
4:34 these little box on it, let's say 5 all the way around,
4:38 and see how that looks, oops we've got to say 5 what, 5 pixels,
4:42 little nice space here, maybe we want to have them a little more spread out
4:47 on the border, so we can say padding, right let's put this like 10.
4:54 Now if I refresh it, you can see there is a little more separation between each of them.
4:58 Here, let me pull this up and then I'll go back
5:00 on like a quick tweak, so we don't have anything there,
5:05 now if I refresh it, you can see this is how it looked before,
5:09 this is how it looks now, and all we had to do to make that happen,
5:13 let's put this back for you, is basically set the display to inline-block
5:17 for the list items and then we did a little bit of work with the box model
5:21 and a little bit of coloring with the pseudo properties on the links.
5:27 And notice, if I click this, it's sort of for a second, here it's been visited,
5:33 we can go change this again, and we can change all
5:39 this like so, we don't want to do it here, sorry, we can do it up here,
5:43 we can say we have this, we can come over and say "visited"
5:47 and we can also hit the other state that we might have for this
5:50 which would be "active".
5:56 Maybe we could even, maybe we'll do something different
5:58 for "active", so you can see it more clear,
6:06 make this yellow, OK, so if I click this
6:08 you can see I probably stop for just a second,
6:11 you can see the yellow, so that's the "active".
6:14 All right, so from this, to that, change a few layout properties
6:18 and change of the colors, pretty nice.