Layouts Part 2

Media Queries
Allow us to change the layout without changing the content

Layout differs based on screen size

ViewPort
• Add a viewport call to get the width before the CSS
• In the header
• <meta name="viewport" content="width=device-width,initial-scale=1">

Ways to Use Media Queries
• <link> within HTML
• <link rel=“stylesheet” href=“screen-layout.css” type=“text/css” media=“screen” />
• @media within CSS
• @media screen { body {style rules;} }

3_column_layout_relative.html
<html>
<head>
<meta name="viewport" content="width=device-width,initial-scale=1">

/*Structure*/
body {
background-color: yellow;
}
/*once the screen gets to 480px, it switches to this view */
@media screen and (min-width: 480px) {
body {
background-color: lightblue;
}
}

/*once the screen gets to 800px, it switches to this view */
body {
background-color: lightgreen;
}
}
/*once the screen get over to 1200px, it switches to this view */
body {
background-color: white;
}
}

CSS Flexbox
A Layout Alternative to Floats

Why?
• Easier to change layout to mobile
• Gives us control over appearance

Image from https://internetingishard.com/html-and-css/flexbox/

The trick?
• Boils down to two components:
• flex container
• flex items
• Nesting these components gives the flexibility

Turn an item into a flex container by adding:
.menu-container {
/* ... */
display: flex;
}
nav{
/* ... */
display: flex;
}
Nav_layout.css:
nav ul{
display: flex;
}

nav ul {
display: flex;
justify-content: center;
flex-wrap: wrap;
flex-direction: column;
}
Nav_layout.css

Nesting Elements
• Flex containers only know how to position elements that are one level
deep (i.e., their child elements).
• They don’t care one bit about what’s inside their flex items.
• Wrapping a bunch of items in an extra <div> results in a totally
different web page.

nav_layout.css
body {
background-color: lightblue;
}
nav a{
width: 100px;
margin:10px;
}
nav a:hover{
width: 100px;
margin:10px;
}
nav ul {
flex-direction: row;
}
}

nav li:first-child{
margin-right: auto;
}

Using the figure Element
• An image can be used as a logo, a background image, a bullet for a list
item, or the basis of an image map.
• When an image is provided for informational purposes, it can be
marked with the figure element rather than a paragraph or
another block-level element.
• The figure element can also include a caption, which you mark
using the figcaption element.

Using the figure Element
• Syntax for marking a figure:
<figure>
<img src = "imagefilename" />
</figure>
• To include a caption with a figure, add:
<figcaption>caption</figcaption>
• The figcaption content appears below the image.
• The figcaption element is nested inside the figure element.

<figure>
<img src="images/balloons.jpg">
<figcaption>Fig. 1 Neuf Balloons</figcaption>
</figure>
Some CSS is already set up for figure and figcaption in gallery_layout.css
This code does not normally make changes to the HTML layout!!!

Add div around the gallery
<div class="flex-container">
…
…
…
//all figures and captions
</div>

Setting up the gallery – gallery_layout.css
Now, add a flex layout to the .flex-container
.flex-container {
display: flex;
flex-wrap: wrap;
flex-direction:row;
justify-content: space-around;
}

Layouts Part 2

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