Girl Develop It is here to provide affordable and accessible programs to learn software through mentorship and hands-on instruction.
Some "rules"
A website is a way to present your content to the world, using HTML and CSS to present that content & make it look good.
CSS = Cascading Style Sheets
CSS is a "style sheet language" that lets you style the elements on your page.
CSS is works in conjunction with HTML, but is not HTML itself.
All colored text, position, and size
selector {
property: value;
}
A block of CSS code is a rule.
The rule starts with a selector.
It has sets of properties and values.
A property-value pair is a declaration.
Declarations: Property and value of style you plan use on HTML element.
Declarations end with a semicolon
Declaration groups are surrounded by curly brackets.
selector {
property: value;
property: value;
property: value;
}
p {
property: value;
}
Selects all paragraph elements.
img {
property: value;
}
Selects all image elements.
Each property can have one or more comma separated values.
p{
color: white;
background-color: red;
font-family: Arial, sans-serif;
}
The color property changes the color of the text.
p {
color: red;
color: #ff0000;
color: rgb(255, 0, 0);
}
Any of these will turn the text of this paragraph red.
The background-color property changes the color of the background.
p {
background-color: black;
background-color: #000000;
background-color: rgb(0,0,0);
}
We have several ways of representing color. These are all the same blue:
p {
color: blue;
color: #0000ff;
color: rgb(0, 0, 255);
}
Color names
Some basic color name examples: aqua, black, blue, fuchsia, gray, grey, green, lime, maroon, navy, olive, purple, red, silver, teal, white, and yellow.
(And there are lots more!)
Hexadecimal and RGB values
Represent the amount of Red, Green, and Blue in a color, from 0 to a maximum of 255 or FF.
3 ways
"Inline"
"Embedded"
"External"
<p style="color:red">Some text.</p>
Uses the HTML attribute style.
Difficult to use in large projects
Not preferred.
<head>
<style type="text/css">
p {
color: blue;
font-size: 12px;
}
</style>
</head>
Inside <head> element.
Uses <style> tag.
Can only be used in one html file
<head>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
Shared resource for several pages.
Reduced file size & bandwidth
Easy to maintain in larger projects.
Preferred by nerds everywhere!
The font-family property defines which font is used.
p {
font-family: "Times New Roman";
font-family: serif;
font-family: Helvetica, Arial, sans-serif;
}
Specific font name
Generic name
Comma-separated list
The font-size property specifies the size of the font.
p {
font-size: 12px;
font-size: 1.5em;
font-size: 100%;
}
Pixels
"em"
Percentage
p {
font-style: italic;
font-weight: bold;
font-size: 10px;
font-family: sans-serif;
}
OR
p {
font: italic bold 10px sans-serif;
}
The line-height property specifies the amount of space each line of type takes up.
p {
line-height: 18px;
line-height: 1.5em;
line-height: 150%;
line-height: 1.5;
}
Note: Line-height includes the height of the type! If your line-height is smaller than your font-size, you will get overlapping lines.
The text-transform property allows you to override the capitalization of an entire block of text, regardless of how the text was actually entered.
h2 {
text-transform: uppercase;
text-transform: lowercase;
text-transform: capitalize;
}
#footer {
property: value;
}
Selects all elements with an id of "footer".
<p id="footer">Copyright 2011</p>
The associated HTML.
.warning {
color: red;
}
Selects all elements with a class of "warning".
<p class="warning">Run away!</p>
The associated HTML.
The "#" is how you tell CSS "this is an id."
The "." is how you tell CSS "this is a class name."
p em {
color: yellow;
}
Selects all em elements that are within a paragraph
<p>This is <em>important.</em></p>
This is important.
Styles "cascade" down until changed
p{
color: blue;
font-family: 'Helvetica';
}
.red{
color: red;
}
#special{
font-family: Arial;
}
<p>Paragraph</p>
<p class="green">Paragraph</p>
<p class="red">Paragraph</p>
<p class="red" id="special">Paragraph</p>
Many CSS properties have self-explanatory names: