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    --- tags: lecture slideOptions: theme: night transition: slide --- # CSS --- ## What is CSS - **C**ascading **S**tyle **S**heet - 用來決定html elements在網頁上的長相、位置 ---- ## What CSS looks like ```css= body { background-color: lightblue; } h1 { color: white; text-align: center; } p { font-family: verdana; font-size: 20px; } ``` --- ## 與 html 的連結 1. 寫在外部檔案 (styles/main.css) ```htmlembedded= <head> ... <link rel="stylesheet" type="text/css" href="./styles/main.css" /> ... </head> ``` ---- 2. 直接寫在 `<style></style>` tag 裡 ```htmlembedded= <head> ... <style> h1 {color: white;} body {background-color: lightblue;} </style> ... </head> ``` ---- 3. 直接寫在 tag 的 attribute 裡 (Inline CSS) ```htmlembedded= <body> ... <h1 style="color:blue; text-align:center;">This is a heading</h1> <p style="color:red;">This is a paragraph.</p> ... </body> ``` --- ## CSS Syntax ![](https://www.w3schools.com/css/selector.gif) --- ## CSS Selectors ### 1. Simple selectors - base on tag ```css= /* Example: 所有的 <p> 都會符合受此 CSS 影響 */ p { text-align: center; color: red; } ``` ---- - base on id ```css= /* id 是在 html 中獨一無二的,不該出現兩個有同樣 id 的 tag */ /* 符合此 id 的 tag 都會影響 */ /* ex. <p id="title">我想當標題</p> */ #title { color: black; font-size: 36px; font-weight: bold; } ``` ---- - base on class ```css= /* 並不唯一, 可以同時對很多有相同 class 的 tag 做調整 */ /* 符合此 class 的都會影響 */ /* ex. <p class="title">我想當標題</p> */ .title { color: black; font-size: 36px; font-weight: bold; } /* 可同時滿足多個 class,並用空白隔開 */ ``` ---- - universal selector ```css= /* 影響所有 html element */ * { text-align: center; color: blue; } ``` ---- - grouping selector ```css= /* 同時影響多的 element */ h1, h2, p { text-align: center; color: red; } ``` --- ### 2. Combinator selectors - Descendant Selector (space) ```css= /* 所有在 <div> 裡面的 <p> */ div p { background-color: yellow; } ``` - Child Selector (>) ```css= /* 所有在 <div> 裡面「第一層」(children) 的 <p> */ div > p { background-color: yellow; } ``` ---- - Adjacent Sibling Selector (+) ```css= /* 所有 與 <div> 相連的<p> (同一層) */ div + p { background-color: yellow; } ``` - General Sibling Selector (~) ```css= /* <div> 之後的所有 <p> (同一層) */ div ~ p { background-color: yellow; } ``` ---- ![](https://i.imgur.com/qM8zH47.png) --- ### 3. Pseudo-class selectors Define a special state of an element **語法:** ```css= selector:pseudo-class { property: value; } ``` ---- **Example:** ```css= /* unvisited link */ a:link { color: #FF0000; } /* visited link */ a:visited { color: #00FF00; } /* mouse over link */ /* 必須在 link, visited 之後! */ a:hover { color: #FF00FF; } /* selected link */ /* 必須在 active 之後! */ a:active { color: #0000FF; } ``` --- ### 4. Pseudo-elements selectors - Style 某 element 第一個字母、第一行 - 在 element 的前後插入東西 **語法:** ```css= selector::pseudo-element { property: value; } ``` ---- **Example:** ```css= p::first-letter { /* 第一個字母 */ color: #ff0000; font-size: xx-large; } p::first-line { /* 第一行 */ color: #0000ff; font-variant: small-caps; } h1::before { /* 內容之前插入 url */ content: url(smiley.gif); } h1::after { /* 內容之後插入 url */ content: url(smiley.gif); } ::selection { /* 用滑鼠反白的內容 */ color: red; background: yellow; } ``` --- ### 5. Attribute selectors 以 attribute 來分辨作用對象 **Example:** ```css= input[type="text"] { width: 150px; display: block; margin-bottom: 10px; background-color: yellow; } input[type="button"] { width: 120px; margin-left: 35px; display: block; } ``` --- ## CSS Comments ```css= /* */ ``` --- ## CSS Colors ```css= div { color: blue; background-color: rgba(79, 196, 255, 0.5); } ``` ---- 色碼示方法: ```css= blue /* 內建顏色,有140種 */ rgb(79, 196, 255) /* rgb (紅綠藍) */ #4fc4ff /* HEX (16進位表示 rgb) */ hsl(200°, 100%, 65%) /* HSL (色相、飽和度、亮度)*/ /* 多一個參數 (0~1),意思是透明度 */ rgba(79, 196, 255, 0.3) hsla(200°, 100%, 0.2) ``` ---- 如何尋找喜歡的顏色? Google 搜尋: Color picker --- ## CSS Background ```css= body { background-color: rgba(0, 0, 0, 0.8); background-image: url("http://blog.hostbaby.com/wp-content/uploads/2013/07/scuffedstatic_dark1400x900.jpg"); /* 預設會 repeat 至填滿 */ /* 也可以設定縱向、橫向 repeat 即可 (repeat-y, repeat-x) */ background-repeat: no-repeat; background-position: left top; background-attachment: fixed; /* scroll or fixed */ background-size: cover; } ``` --- ## CSS Borders property: **上 右 下 左** (four values) property: **上 右左 下** (three values) property: **上下 左右** (two values) property: **全部** (one value) ```css= div.border { border-style: dotted solid; border-width: 1px 2px 1px 6px; border-color: white; border-radius: 20px; } div.border-short { border: 3px solid lightgray; } ``` --- ## CSS Box Model ![](https://newbieengineerblog.files.wordpress.com/2016/12/css-box-model1.png?w=676) ---- ### Margin ```css= div.margin { margin-top: 3px; margin-right: 6px; margin-bottom: 9px; margin-left: 12px; /* margin: 3px 6px 9px 12px; */ /* margin: 3px 6px 9px; */ /* margin: 3px 6px; */ } ``` ---- ### Padding ```css= div.padding { padding-top: 1px; padding-right: 2px; padding-bottom: 3px; padding-left: 4px; /* padding: 3px 6px 9px 12px; */ /* padding: 3px 6px 9px; */ /* padding: 3px 6px; */ } ``` ---- ### Height and Width ```css= div { height: 30%; width: 500px; } ``` ---- ### Element's height and width - 預設是一個element的長寬是 height/width + padding + border - 所以想要以 width / height 來作為排版用的長寬 `box-sizing: border-box;` ```css= * { box-sizing: border-box; } ``` --- ## CSS Text ```css= p.text { color: white; text-align: left; /* left right */ text-decoration: underline; /* none, overline, line-through */ text-transform: uppercase; /* lowercase capitalize */ text-indent: 30px; letter-spacing: 3px; line-height: 1.8; word-spacing: 10px; white-space: nowrap; } ``` --- ## CSS Font ```css= p { font-family: Arial, Helvetica, sans-serif; font-style: italic; /* normal, oblique */ font-weight: bold; font-size: 18px; } ``` 也有其他字體,中文也有很多字體,自行 Google~ --- ## CSS Display 大多是 element 預設是 block 或是 inline ---- ### Block-level elements 會換行,寬度會拉到最寬 ```html= <div> <h1> - <h6> <p> <form> <header> <footer> <section> ... ``` ---- ### Inline Elements 同行,寬度會是最多他可以的量 ```html= <span> <a> <img> ... ``` ---- ### Display - 可覆蓋 element 的預設 display - 可配合 js 做東西的顯示跟隱藏 ```css= .hidden { display: none; /* block, flex, inline-block ... */ } li { display: inline; } ``` https://www.w3schools.com/cssref/pr_class_display.asp --- ## CSS Position ```css= div.fixed { postion: fixed; /* static, relative, absolute, sticky */ } ``` ---- ### static - default value - 不被 top, bottom, left, right 影響 ### relative - 與原本該在的位置做相對的移動 ```css= div.relative { position: relative; left: 30px; border: 3px solid #73AD21; } ``` ---- ### fixed - 鎖定與整個視窗的相對位置 - 就算滑動頁面,也在同樣的位置 ```css= div.fixed { position: fixed; bottom: 0; right: 0; width: 300px; border: 3px solid #73AD21; } ``` ---- ### absolute - 與最近一層 position 不是 static 的 element 做相對計算 - 若上層皆沒有設 postion,那就是與整個 body 做相對計算 - 會隨著 scroll 滑動 ```css= div.absolute { position: absolute; top: 80px; right: 0; width: 200px; height: 100px; border: 3px solid #73AD21; } ``` ---- ### sticky - 會跟著滑動,直到到達符合的 postion 位置 ```css= div.sticky { position: -webkit-sticky; /* Safari */ position: sticky; top: 0; /* 跟著滑動直到 top = 0, 此時便會黏在最上方 */ background-color: green; border: 2px solid #4CAF50; } ``` ---- ### Overlapping Elements 有東西互相蓋到 -> `z-index` ```css= img { z-index: -1; } ``` --- ## CSS Overflow - visible: 預設,超出頁面的直接就超出去了 - hidden: 超出頁面的直接隱藏看不到 - scroll: 加一個 scroll bar,可以滑到超出的頁面 - auto: 在需要的時候加一個scroll bar --- ## CSS Align 各種把東西擺好的方法 https://www.w3schools.com/css/css_align.asp --- ## CSS Specificity 一個 element 被多個 selector 選擇到而有衝突順位時: - elements < classes < id < inline styles `Ex. div < div.hello < div#hi < <div style="color:red">` - 同樣的設定下面的會覆蓋之上的 ```css= h1 {background-color: yellow;} h1 {background-color: red;} /* 覆蓋上面的,所以會顯示紅色 */ ``` - 越詳細的會越優先 `div#a > #a > div[id=a]` --- ## CSS Units - Absolute Lengths 絕對長度單位 cm, mm, in(inches), **px(pixels)**, pt, pc 其中 px 會跟顯示器的解析度有關,較常用到 ```css= h1 { font-size: 50px; } ``` ---- - Relative Lengths 相對 - **em**: 與現在所在的 element 的 font-size 相對 - **rem**: 與 root element (`<html></html>`的 font-size 相對 - vw: viewport(網頁的可視範圍) 寬度的 1% - vh: viewport 高度的 1% - **%**: 與上一層的 element 的相對 % 數 ---- 通常會用相對的單位,這樣支援不同螢幕大小可以有相對的縮放 其中 **em**, **rem** 很適合用作網頁單位,可以支援不同螢幕大小的裝置 ```css= html { font-size: 16px; } h1 { font-size: 3rem; } ``` --- 其實我們根本也不會記這麼多,都是用到了再去查,所以剩下的有興趣了解也可以自己看喔! ---- ## CSS Flex https://www.w3schools.com/css/css3_flexbox.asp https://cythilya.github.io/2017/04/04/flexbox-basics/ - 排版神器 - 分外層內層 - 外層是 container,用來排版內層的 item (element) - container: - flex-direction: 主軸方向 - row(default), column, row-reverse, column-reverse - flex-wrap: 是否換行 - wrap, nowrap - flex-flow: 上面兩個的一行寫法 - [flex-direction], [flex-flow] - justify-content: 主軸方向上的對齊方式 - center, flex-start, flex-end, space-around, space-between, space-evenly - align-items: 垂直主軸方向上的對齊 - center, flex-start, flex-end, stretch(default), baseline - align-content - item: - flex-grow: 每一個 item 所佔比例 (數字) - flex-shrink: 被壓縮的比例 (數字) - flex-basis: item 的原始長度 - flex: 上面三個的一行寫法 [flex-grow] [flex-shrink] [flex-basis] - - order: item 的順序 (數字) - align-self: 覆蓋原本上層的 align-items 屬性 ```css= /* css */ .flex-container { display: flex; background-color: DodgerBlue; flex-direction: row; flex-wrap: nowrap; justify-content: center; align-items: flex-start; } .flex-container > div { background-color: #f1f1f1; margin: 10px; padding: 20px; font-size: 30px; } ``` ```htmlembedded= <!-- html --> <div class="flex-container"> <div style="flex-grow: 3;">1</div> <div>2</div> <div style="align-self: flex-end">3</div> </div> ``` ## CSS Gradients 顏色漸層 - Linear Gradients - Syntax `background-image: linear-gradient(direction(0deg), color1, color2, color3 ...)` - direction: - to down (default) (上到下) - to right (左到右) - to bottom right (左上右下) - 要重複的話就用 repeating-linear-gradient - Radial Gradients - Syntax `background-image: linear-gradient(shape size at position, color1, color2, color3 ...)` ## CSS Shadow - text-shadow 對文字做陰影 ```css= .text-shadow { text-shadow: 2px 2px 15px blue; /* 橫向,縱向,模糊大小 */ } ``` - box-shadow 對整個 element 做陰影 ```css= .box-shadow { box-shadow: 2px 2px 15px grey; /* 橫向,縱向,模糊大小 */ } ``` ## CSS Transform - transform: - translate(x, y) 從原來位置移動 x, y - rotate(xdeg) 順時針旋轉 x 度 - scaleX(n) x 向放大 n 倍 - scaleY(n) y 向放大 n 倍 - scale(n1, n2) x 向放大 n1 倍, y 向放大 n2 倍 - skewX(xdeg) x 向歪斜 x 度 - skewY(ydeg) y 向歪斜 y 度 - skew(x, y) 歪斜 x , y 度 - matrix(scaleX(),skewY(),skewX(),scaleY(),translateX(),translateY() - 3D transform https://www.w3schools.com/css/css3_3dtransforms.asp ## CSS Transition 1. 漸漸地變換 properties 2. 需要給他預計要變換的 property 跟 此效果的持續時間 - transition: property1 [n1]s, property2 [n2]s ... - 對 property1 的變化持續時間為 n1 秒,property2 的變化持續時間為 n2 秒 - transition-delay: [n]s - 變化 delay n 秒才開始 - transition-duration: - 變化持續時間 - transition-property - 預計變化的 property - transition-timing-function (https://www.w3schools.com/css/tryit.asp?filename=trycss3_transition_speed) - ease: 一開始慢,接著快,最後慢 - linear: 一樣的快慢 - ease-in: 一開始慢 - ease-out: 最後慢 - ease-in-out: 一開始跟最後慢 - cubic-bezier(n, n, n, n): 自己設定(https://www.w3schools.com/cssref/func_cubic-bezier.asp) ## CSS Animations 用 CSS 做動畫效果 - @keyframes - animation-name - animation-duration - animation-delay - animation-iteration-count - animation-direction - animation-timing-function - animation-fill-mode - animation ```css= .animation { width: 100px; height: 100px; background-color: red; position: relative; animation-name: example; /* 對應的動畫效果 */ animation-duration: 5s; /* 一次動畫的時間 */ animation-timing-function: linear; /* 動畫的變化 */ animation-delay: 2s; /* 開始動畫前的delay */ animation-iteration-count: infinite; /* 動畫循環次數 */ animation-direction: alternate; /* 動畫正轉、倒轉(reverse)、輪流 */ } @keyframes example { /* 動畫進展到幾%的時候會呈現的樣子 */ 0% {background-color:red; left:0px; top:0px;} 25% {background-color:yellow; left:200px; top:0px;} 50% {background-color:blue; left:200px; top:200px;} 75% {background-color:green; left:0px; top:200px;} 100% {background-color:red; left:0px; top:0px;} } ``` ## CSS Media Query and responsive 可以檢查 device 的 width, height,然後做不一樣的 css,可以對應不同大小的螢幕做不一樣的調整 (Responsive) ```css= /* 當螢幕寬度小於 600px 時, 背景變成淺藍色 */ @media screen and (max-width: 600px) { body { background-color: lightblue; } } ``` 常用寬度特判: ```css= /* Extra small devices (phones, 600px and down) */ @media only screen and (max-width: 600px) {...} /* Small devices (portrait tablets and large phones, 600px and up) */ @media only screen and (min-width: 600px) {...} /* Medium devices (landscape tablets, 768px and up) */ @media only screen and (min-width: 768px) {...} /* Large devices (laptops/desktops, 992px and up) */ @media only screen and (min-width: 992px) {...} /* Extra large devices (large laptops and desktops, 1200px and up) */ @media only screen and (min-width: 1200px) {...} ``` 更多 Example: https://www.w3schools.com/css/css3_mediaqueries_ex.asp ## Templates 不想自己寫 CSS,可以去套版,然後做微調 無腦套版: https://html5up.net/ 歷時很久的套版網站: https://getbootstrap.com/ 長得像Google的東西: https://material.io/design/ 有混合其他版型: https://semantic-ui.com/ ## Reference w3schools: 寫得很親民,還可以實作 https://www.w3schools.com/css/default.asp MDN: 寫的比較詳細,查資料常用 https://developer.mozilla.org/en-US/docs/Learn/CSS css tricks: 好像很多炫砲的東西 https://css-tricks.com/ cheatsheets: https://websitesetup.org/css3-cheat-sheet/ https://htmlcheatsheet.com/css/ --- ### HOMEWORK 把剛剛你的網頁用CSS變漂亮吧! ---

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