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<v Voiceover>Let's take a small break</v>

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and talk about a very important thing in modern web design,

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responsive web design.

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You have probably heard of it by now.

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So, in this lecture we will set up our project

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to that we can easily build a responsive website.

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So, what is responsive web design?

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Building a responsive website means that that website

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will work well on any device

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and with any screen resolution.

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Working well means that that website is easy to read

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and to navigate without needing to constantly zoom in

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and zoom out, which is really annoying.

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Here are just two examples of responsive websites.

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You can see that they change with the browser's width

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which means that they respond to the screen size;

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therefore, the name responsive web design.

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According to Google, 50% of all internet traffic

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already happens on mobile phones

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and this will even increase in the future.

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In fact, Google recently announced

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that mobile-friendly websites will be ranked higher

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on their Search Results page.

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So, it's really important

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to embrace responsive web design right now.

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So, there are three main ingredients

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to responsive web design.

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First is the fluid grid.

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In a fluid grid all layout elements are sized

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in relative units like percentages

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instead of absolute units like pixels.

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in the CSS section we used a static layout

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and defined width with pixels.

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Now we are leaving that behind and work with percentages.

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We will set up the fluid grid in a minute.

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And the same goes for images so as to prevent them

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from displaying outside their parent elements.

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And finally, media queries allow us to specify

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different CSS rules for different browser width.

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With media queries we can target different devices

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like mobile phones and tablets

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and make the website respond to their screen size.

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So, now that we know the main ingredients

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to responsive web design let's go back to brackets

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and set up the fluid grid.

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We will then build our website using that grid

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in the next lectures.

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We will take care of the media queries part later

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after building our webpage.

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While we build the webpage it's just important

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that we always use the grid.

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Now, the fluid grid we will use in this course

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is based on this little responsive grid system,

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which claims to be spectacularly easy responsive web design.

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So you can build any layout you can imagine

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with this fluid grid.

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I actually made some changes that makes things easier for us

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and compiled everything in one file.

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Please go download that file

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from the lecture description right now.

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We will come back to this website later

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so I can show you how that grid works.

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So I hope you downloaded the file by now.

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I actually already have it here on my desktop

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so I will copy it.

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And then we put it in the Vendors folder

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because once again it's a file that we got from the internet

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and then in the CSS folder.

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And here we go, alright.

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So now back to brackets.

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Let's include that file.

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I'll do it here.

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Again, before the style CSS, which is our CSS file,

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and let me just tell you another trick

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which is I can

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since I don't want to write all of this again

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and instead of copying which is a little annoying

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I can just do

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duplicate, which is Command + D

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or probably Control + D on Windows.

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So right here just Command + D and here we go.

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'Cause all I want to change now is this file.

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So I want the grid file, right.

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So now the grid file is included in our project.

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Now let me show you how that grid works.

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So on this website is a little example.

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So all our content will be inside columns,

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as you can see here.

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And each of these group of columns is a row.

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So in each row we can have two or three or four or five

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all the way to 12 columns

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which all have the same width.

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And now as for the responsive part,

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if we resize the browser window

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all of them shrink

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and that means that they are defined with a relative width

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because their width is always relative

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to the browser window.

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So they get smaller and smaller

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as I decrease the browser window.

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And that's what responsive web design is all about.

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And after a certain amount of width

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they even stack.

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So when they get too small we can't see any content

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in this column here, right?

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Then they will all stack

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just like this.

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In our website, since we will use this grid,

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we'll do the same.

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Okay, so then let's see the CSS file

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that we just included and it's down here.

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Let me just open it.

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And if I click it twice, double click,

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then it appears up here in the working files.

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So we have a row

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and columns

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and then different spans

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and each of this span will be a column.

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For example this span one of two

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is just columns.

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But don't worry, we will use that in the next lecture

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and then you will understand everything

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just how this works.

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Alright, let's get back to our HTML file.

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And as I said, the content will be in rows.

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So let's just define the row

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and I will simply call it row.

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And what I want for this row

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is a maximum width

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of 1,140 pixels

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just as we used in our previous project.

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So this is the only value

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that will have an absolute value in pixels.

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We will define all other layout margins

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in pettings and percentages

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and not in pixels.

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And now I also want to center this row

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on the webpage so all our rows will be centered.

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So do you remember how we did that?

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We'll just set margin

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and then to center a container

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inside another container

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as you remember we set the left margin to auto

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and the right margin to auto.

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You probably also remember

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that we can use a shorthand to set margins just like this.

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Top and right

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and bottom and left.

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Alright, but there's an even simpler way of doing this.

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So let me show you that as well.

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Which is we can say zero and auto

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and then top and bottom will be zero

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and left and right will be auto.

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Let me delete this

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and now this row will be centered.

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You can just try this out.

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So I'll say div and class will be row.

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Alright, just put us here.

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And let's see how this looks like.

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Okay, you'll see it's perfectly centered.

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So now we have everything in place

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so we can start building the first section of our webpage

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which will be the header.

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So don't wait, and join me in the next lecture.

