[udemy]WebDevelopment_CSS
Your First CSS(Cascading Style Sheets)
Cascading means it always takes selector that is at the end 即后面的可以覆盖前面的。 比如
在以下css文件中定义了两次 <p></p> 的颜色，最终它会呈现green。
h2{
color: red;
}
p{
color: pink;
}
p{
color: green;
}
syntactic rule is very straightforward:
Selector{
Property: value;
}
How to comment:
command + /
比如我们很喜欢某个网站的feature
we can right click
do'inspect'
我想<h2>Home</h2>变成红色，怎么办
<!DOCTYPE html>
<html>
<head>
<title>CSS learning</title>
</head>
<body>
<header>
<ul>
<li>Home</li>
<li><a href="about.html">About</a></li>
<li><a href="login.html">login</a></li>
</ul>
</header>
<section>
<h2>Home</h2>
<p>Lollll</p>
</section>
</body>
</html>
新一个css文件
但是refresh之后，为何index.html的h2没变色？
Obviously
How does index.html know style.css exist ?
We need to link each other
So we add link in the <head></head>
<!DOCTYPE html>
<html>
<head>
<title>CSS learning</title>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<header>
<ul>
<li>Home</li>
<li><a href="about.html">About</a></li>
<li><a href="login.html">login</a></li>
</ul>
</header>
<section>
<h2>Home</h2>
<p>Lollll</p>
</section>
</body>
</html>
And make sure these two files in the same folder
we can create multiply style sheets 
Beside <1>creating style.css file, we can also <2>'inline style' which is by specifying within the element
<!DOCTYPE html>
<html>
<head>
<title>CSS learning</title>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<header style="background-color: yellow">
<ul>
<li>Home</li>
<li><a href="about.html">About</a></li>
<li><a href="login.html">login</a></li>
</ul>
</header>
<section>
<h2>Home</h2>
<p>Lollll</p>
</section>
</body>
</html>
<3> using 'style' tags inside of <head></head>
<!DOCTYPE html>
<html>
<head>
<title>CSS learning</title>
<link rel="stylesheet" type="text/css" href="style.css">
<style >
li{
background-color: purple;
}
</style>
</head>
<body>
<header style="background-color: yellow">
<ul>
<li>Home</li>
<li><a href="about.html">About</a></li>
<li><a href="login.html">login</a></li>
</ul>
</header>
<section>
<h2>Home</h2>
<p>Lollll</p>
</section>
</body>
</html>
CSS Properties
recommend website for CSS Properties : CSS Tricks
make your text in the center
text-align: center;
define the border
border: 5px solid purple;
add background image
/*本地图片*/
body{
background-image: url(backgroundimage.jpg);
}
/*网上图片*/
body{
background-image: url(www.unsplash.com/image2);
}
make background image fits the screen
body{
background-image: url(www.unsplash.com/image2);
background-size: cover;
}
add cursor(光标)
p{
color: pink;
cursor: pointer;
}
display in line
li{
list-style: none;
display: inline-block;
}
find the specific color: paletton.com
choose hex or RGB whichever way
h2{
color: #AA9739;
text-align: center;
border: 5px solid rgb(170, 151, 57);
}
Cascading Style Sheets at the most basic level it indicates that the order of CSS rules matter.
.class
we can give any value we want, whatever we want to call it
<p class="webtext">Lollll</p>
.webtext{
border: 5px dashed purple;
}
#id
similar to .class except that you can use only once
<div id="div1">
<p class="webtext">Lollll</p>
<p>Lollll</p>
<p>Lollll</p>
</div>
#id{
background: blue;
}
element
p{
color: green;
}
element, element
h2, p {
color: #AA9739;
text-align: center;
border: 5px solid rgb(170, 151, 57);
}
element element
I want you to select all 'p' s inside 'h2'
<h2>Home<p>Jennifer's home</p></h2>
h2 p {
color: #AA9739;
text-align: center;
border: 5px solid rgb(170, 151, 57);
}
element > element
I want to select all 'p's that have a parent of 'h2'
h2 > p {
color: #AA9739;
text-align: center;
border: 5px solid rgb(170, 151, 57);
}
element + element
I want to select any 'p' that is exactly after an 'h2' element
h2 + p {
color: #AA9739;
text-align: center;
border: 5px solid rgb(170, 151, 57);
}
:hover
nothing happens but when I hover my mouse, it changes the style to what we just wrote down
h2 + p: hover{
color: #AA9739;
text-align: center;
border: 5px solid rgb(170, 151, 57);
}
:last-child
only the last child of each webtext changes
.webtext:last-child{
border: 5px dashed purple;
}
:first-child
same as last-child
!important (not recommended)
overrides any of the css rules and say, hey I don't care what anybody else says , 'p' should always be pink
p{
color: pink !important;
cursor: pointer;
}
p{
color: green;
}
add underline to text
p{
text-decoration: underline;
}
change text to uppercase
p{
text-transform: uppercase;
}
make space between text
p{
line-height: 20px;
}
change font style
font-family: "Times New Roman", Georgia; means if former one doesn't exist, pick the latter one
Use Google Fonts, we can add some specific fonts in own website
当然，这样会减慢你的网页反应速度
因为你的字体需要通过Google的链接响应
p{
line-height: 20px;
font-style: italic;
font-weight: bold;
font-size: 80%;
font-family: "Times New Roman", Georgia;
}
add image
<img src="https://previews.123rf.com/images/tharun15/tharun151606/tharun15160600056/58764289-a-circular-geometric-design-for-summer-solstice-day-in-june-on-a-white-background.jpg" width="50px" height="40">
critical render path
For now, sever is our computer
we request html
and the browser check I need css file
grab css file
hold on, the browser check I need font file
after that, it could render the page(display)
So you won't be able to render a web page until you receive css file and
sometimes font files you also have to wait for the font file to render the page
So if want your website faster, use your own font files and don't make css file too big
So you can enter you css code into minify CSS https://www.cleancss.com/css-minify/ to make it seem smaller
Flexbox
Flex 是 Flexible Box 的缩写，意为"弹性布局"，用来为盒状模型提供最大的灵活性。
https://css-tricks.com/snippets/css/a-guide-to-flexbox/
http://flexboxfroggy.com/
<!DOCTYPE html>
<html>
<head>
<title>CSS</title>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<h1>Life in the wild</h1>
<div class="container">
<img src="https://static.pexels.com/photos/52500/horse-herd-fog-nature-52500.jpeg">
<img src="https://static.pexels.com/photos/66898/elephant-cub-tsavo-kenya-66898.jpeg">
<img src="https://static.pexels.com/photos/213399/pexels-photo-213399.jpeg">
<img src="https://static.pexels.com/photos/158471/ibis-bird-red-animals-158471.jpeg
">
<img src="https://static.pexels.com/photos/133459/pexels-photo-133459.jpeg">
<img src="https://static.pexels.com/photos/50988/ape-berber-monkeys-mammal-affchen-50988.jpeg">
</div> </body>
</html>
.container{
display: flex;
flex-wrap: wrap;
justify-content: center;
}
h1{
font-family: fantasy;
font-size: 3em;
border-bottom: 2px solid pink;
border-right: 2px solid pink;
width: 400px;
text-align: center;
}
img{
width: 450px;
height: 300px;
margin: 10px;
}
Exercise
<!DOCTYPE html>
<html>
<head>
<title>RoboPage</title>
<link rel="stylesheet" type="text/css" href="style.css">
<link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet">
</head>
<body>
<h1>Robot Friend</h1>
<div class="robots">
<div class="android">
<div class="head">
<div class="eyes">
<div class="left_eye"></div>
<div class="right_eye"></div>
</div>
</div>
<div class="upper_body">
<div class="left_arm"></div>
<div class="torso"></div>
<div class="right_arm"></div>
</div>
<div class="lower_body">
<div class="left_leg"></div>
<div class="right_leg"></div>
</div>
</div>
</div>
</body>
</html>
h1 {
text-align: center;
font-family: 'Roboto', sans-serif;
}
.robots {
flex-wrap: wrap;
display: flex;
justify-content: center;
}
.head,
.left_arm,
.torso,
.right_arm,
.left_leg,
.right_leg {
background-color: #5f93e8;
}
.head {
width: 200px;
margin: 0 auto;
height: 150px;
border-radius: 200px 200px 0 0;
margin-bottom: 10px;
}
.eyes {
display: flex
}
.head:hover {
width: 300px;
transition: 1s ease-in-out;
}
.upper_body {
width: 300px;
height: 150px;
display: flex;
}
.left_arm, .right_arm {
width: 40px;
height: 125px;
border-radius: 100px;
}
.left_arm {
margin-right: 10px;
}
.right_arm {
margin-left: 10px;
}
.torso {
width: 200px;
height: 200px;
border-radius: 0 0 50px 50px;
}
.lower_body {
width: 200px;
height: 200px;
/* This is another useful property. Hmm what do you think it does?*/
margin: 0 auto;
display: flex;
}
.left_leg, .right_leg {
width: 40px;
height: 120px;
border-radius: 0 0 100px 100px;
}
.left_leg {
margin-left: 45px;
}
.left_leg:hover {
-webkit-transform: rotate(20deg);
-moz-transform: rotate(20deg);
-o-transform: rotate(20deg);
-ms-transform: rotate(20deg);
transform: rotate(20deg);
}
.right_leg {
margin-left: 30px;
}
.left_eye, .right_eye {
width: 20px;
height: 20px;
border-radius: 15px;
background-color: white;
}
.left_eye {
/* These properties are new and you haven't encountered
in this course. Check out CSS Tricks to see what it does! */
position: relative;
top: 100px;
left: 40px;
}
.right_eye {
position: relative;
top: 100px;
left: 120px;
}
Responsive UI
should be a priority when building websites
It would show you what your website will look like on iPhone
Reponsive means your website, on no matter what platform, looks good, no cut-offs
[udemy]WebDevelopment_CSS的更多相关文章
- Udemy上免费的angualr2视频教程分享
福利大分享 本文作者:苏生米沿 本文地址:http://blog.csdn.net/sushengmiyan/article/details/52592518 一晚上听了10几节课程,整体感觉很不错的 ...
- [Udemy] Recommender Systems and Deep Learning in Python
1. Welcome 主要讲四部分内容: non-personized systems popularity: 基于流行度或者最大利益化的推荐. 缺点也明显:你可能在特殊地方有些特殊需求, 或者你本来 ...
- Udemy - Angular 2 - The Complete Guide 笔记
1. install > npm install -g angular-cli 2. create app > ng new first-app 3. build app > cd ...
- [udemy]WebDevelopment_HTML5
Build Your First Website 装一个subline text HTML default rule tags with opening and closing <!DOCTY ...
- [udemy]WebDevelopment_History of The Web
WWW vs Internet For the begining, Internet was there. it was for the academics among universities Th ...
- [udemy]WebDevelopment_How the Internet Works
Browsing the web Enter google.com, who is this google.com This question gets asked all the way down ...
- [udemy]WebDevelopment_Bootstrap,Templates
Bootstrap Introduction Bootstrap 相对于CSS, JS 就像PPT模板相对于PPT 说白了就是前人已经做好了(pre-build)很多模板,你可以直接拿来主义 Boot ...
- [Udemy] ES 7 and Elastic Stack - part 3
Section 7: Analyzing Log Data with the Elastic Stack
- [Udemy] ES 7 and Elastic Stack - part 2
Section 3: Searching with Elasticsearch query with json 分页返回 Sort full text 的内容不能用来sort, 比如movie的 ti ...
随机推荐
- 每天一个linux命令（网络）：【转载】route命令
Linux系统的route命令用于显示和操作IP路由表(show / manipulate the IP routing table).要实现两个不同的子网之间的通信,需要一台连接两个网络的路由器,或 ...
- eclipse启动报错：An error has occurred.See the log file D:\eclipse\configuration\1552616709202.log
如题,Eclipse崩了,只能按它留下的线索去看了1552616709202.log: !SESSION -- ::08.739 ----------------------------------- ...
- 建立SSH隧道从外网访问内网服务器
http://blog.trackets.com/2014/05/17/ssh-tunnel-local-and-remote-port-forwarding-explained-with-examp ...
- ETL流程概述及常用实现方法
ETL流程概述及常用实现方法 http://blog.csdn.net/btkuangxp/article/details/48224187 目录(?)[-] 1抽取作业 1手工开发抽取作业时候的常用 ...
- java 方法(函数)
所谓方法,就是用来解决一类问题的代码的有序组合,是一个功能模块. 一般情况下,定义一个方法的语法是: 其中: 1. 访问修饰符:方法允许被访问的权限范围, 可以是 public.protected.p ...
- eclipse 和 Myeclipse中Maven Web项目出现小红叉的 详细解决方法
在我们创建maven项目是常会出现小红叉,如图: 解决办法: 1.可以 点击鼠标右键 maven--->update project.一般可以解决. 2.查看 window---->sh ...
- TCL基本语法
所有的Tcl文件都以.tcl为扩展名. #!/usr/bin/tclsh puts "Hello, World!" TCL,我们使用新的行或分号终止代码前行.但分号不是必要的,如果 ...
- ueditor上传图片时目录创建失败的问题解决方法,不用那么麻烦，其实修改php/config.json这个配置文件里面的路径就行！！
ueditor的真实上传路径提示出来,我进行了如下步骤: 找到了编辑器的上传处理类 Uploader.class.php,大约110行的位置找到了上传失败的提示位置, 将 $this->stat ...
- 管理Linux服务器的用户和组
管理Linux服务器的用户和组 Linux操作系统是一个多用户多任务的操作系统,允许多个用户同时登录到系统,使用系统资源. 为了使所有用户的工作顺利进行,保护每个用户的文件和进程,规范每个用户的权限, ...
- 精《Linux内核精髓：精通Linux内核必会的75个绝技》一HACK #8 调度策略
HACK #8 调度策略 本节介绍Linux的调度策略(scheduling policy).Linux调度策略的类别大致可以分为TSS(Time Sharing System,分时系统)和实时系统这 ...