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So as I shrink the screen, the third column shrinks with it.
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3.15
As I grow the screen, it also grows alongside with how big
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4.62
this window happens to be.
5,882.1
3.13
And so flexbox and grid are some very powerful tools
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2.79
that we can use and just to make it easier
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2.07
for us to be able to use mobile responsive design,
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3.21
to be able to make sure that our pages look good
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2.46
no matter what kind of browser or what kind of device
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3.27
the user is using in order to look at our page.
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2.73
But it turns out that exists a lot of libraries
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2.43
out there that do a lot of this for us, some people that have already written
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3.42
CSS code to make our text look good, to make our buttons look good,
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3.48
in order to make sure that things are mobile responsive.
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2.34
And one of those is called Bootstrap.
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2.46
Bootstrap was a very popular CSS library that we
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2.34
can use in order to use some styling that they
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3.12
have written, such that we don't need to write all the styling from scratch.
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3.96
So this is what Bootstrap's website looks like.
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1.96
I'll go ahead and show it to you now just
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1.7
to give you a sampling for what's available inside
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2.13
of a library like Bootstrap.
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2.43
If I go to getbootstrap.com, here's Bootstrap's website.
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5.54
And if I go to their documentation on this first link here,
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3.4
I can look at all of the Bootstrap components that I'm given access to.
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3.62
These are things like alerts, for example.
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2.43
That here's an alert that's styled in a very particular way.
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2.64
It's in a specific font.
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1.17
It's got a certain amount of padding and certain colors.
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2.61
And if I want to just copy this alert, once I've used Bootstrap's code,
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4.05
I can just apply certain classes to a div
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3.54
and Bootstrap will handle the process of applying the right styles for me.
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3.36
I don't need to write all of these styles by myself from scratch.
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3.17
Bootstrap's written a lot of the styling already.
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3.67
So how do you actually go about using Bootstrap?
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2.42
Well, to get started with Bootstrap, all you
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1.84
need to do is copy the CSS link that Bootstrap gives you
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3.72
to the top of your file.
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1.63
So if I take the CSS link and then go back to something like hello.html,
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4.73
which you'll recall originally looked something like this, just Hello World,
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5.16
I can add some Bootstrap to it to say, all
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2.58
right, I would like to take this HTML file
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4.41
and apply Bootstrap styling to it to make it look a little bit nicer.
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4.06
So I refreshed the page.
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1.16
And now, you'll notice Bootstrap's chosen a custom font for me
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2.82
just to make things look a little nicer in Bootstrap's own eyes.
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3.64
And now, if I want to add Bootstrap elements,
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2.39
I can say, all right, let me go to their components.
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3.28
And I want to add an alert.
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1.31
I can just copy their alert code.
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2.33
Here's their alert code for a primary alert, an alert that looks blue.
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4.45
And I can just inside the body of my page go ahead and add an alert,
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4.85
and maybe change the text to here is my alert, for example.
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Now, when I reload hello.html, I now see an alert that shows up,
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4.5
styled according to Bootstrap styling.
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2.82
And again, I can change that styling just by changing these classes.
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4.54
So a primary alert shows up as blue.
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2
A success alert shows up as green.
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1.62
A danger alert is red.
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1.42
So if I want to give a danger alert-- the user is doing something wrong
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2.96
on the web page, for example--
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1.56
I can change alert primary here inside my HTML to something like alert danger
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5.22
instead.
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1.08
And now when I refresh this page, I now see the alert
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shows up as red instead of blue.
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So Bootstrap gives us access to a lot of these various different types
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3.48
of components, different ways of adding breadcrumbs and alerts and carousels
6,072
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and other elements to our page just to make it easy to make our page look good
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3.78
very, very quickly without having to worry too much about writing
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2.88
our own CSS, because Bootstrap's written a lot of that for us.
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3.8
Bootstrap even includes a way to make sure
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2.44
that web pages are mobile responsive using something
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2.61
called Bootstrap's column model.
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2.94
So I'll show you an example of that now.
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1.84
Bootstrap divides its page into 12 distinct columns.
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5.07
So one thing I can do is I've pulled this up
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2.09
in an example I have in advanced called column zero.html.
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3.87
Notice that inside of the body of my page now,
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2.73
I have a div whose class is container and then a div whose class is row.
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5.13
And Bootstrap divides every row into a 12-unit column.
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4.84
So here, for example, I have a whole bunch
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1.79
of divs that are each 3-unit columns.
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3.06
So if I have four 3-unit columns, that will take up
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3.09
a total amount of space equal to 12, meaning
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2.88
filling up the entirety of the screen.
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2.83
So if I now open up source column zero.html, here's what that looks like.
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6.14
I have four columns, each of which is of width 3.
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3.6
And as a result, as I shrink it, those columns
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2.76
will automatically resize to make sure that they're always
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2.79
the appropriate size.
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1.5
Now, as long as they add up to 12, they don't only to be the same size.
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4.09
So, for example, if I only wanted three columns, instead of four,
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3.8
I could get rid of the fourth column by deleting those rows.
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3.73
And maybe change the second column instead of being a column of size 3,
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4.34
let's make it a column of size 6.
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1.83
So that's a length 6 column instead.
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3.03
And now if I refresh the page, now suddenly I
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2.61
see three columns where the middle one is twice
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3.03
as large as the ones on either end.
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2.13
And as I shrink this down, I can see that it shrinks down as well.
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4.91
And one of the advantages of using Bootstrap columns
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2.57