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    --- title: css 5.5 進階排版語法 tags: css, 5x --- 5.5 0304 css: 進階排版語法 === 完成品:https://codepen.io/tingtinghsu/pen/MxeQwQ # float 文繞圖與 clearfix ## float的問題 ```css article { background-color: lightgray; padding: 10px; } img { width: 500px; float: left; } ``` float可能會會產生`img`的高度超過`article`高度,導致文字框高度消失。 ## 解法一:`clear: both` 在html用`style="clear: both"`清除圖片左漂浮、右漂浮的效果。 ```htmlembedded= <div style="clear: both"> </div> ``` ## 解法二: `clearfix` 在html `div`標籤產生一個新的class。讓裡面的元素把高度撐開。 html ```htmlmixed= <div class="clearfix"> </div> ``` css ```css .clearfix { clear: both; } ``` # Width vs Max-Width 設定最大寬度或最小寬度,讓欄位大小根據瀏覽器視窗縮放時做調整。 html ```htmlmixed <div class="div1">Width=800</div> <div class="div2">Max Width=800</div> <div class="div3">Min Width=800</div> ``` css ```css div { text-align: center; font-size: 2rem; background-color: aquamarine; margin: 3px; color: tomato; } /*寬度固定*/ .div1 { width: 800px; } /*會跟著螢幕寬度縮小,最大800,適合RWD*/ .div2 { max-width: 800px; } /*會跟著螢幕寬度放大,最小800,適合RWD*/ .div3 { min-width: 800px; } ``` # hover: 滑鼠移動過去時出現效果 html ```htmlmixed <a href="#" class="link1">預設連結樣式</a> <a href="#" class="link2">沒有底線的連結</a> <a href="#" class="link3">滑鼠移過去會改變顏色,消除底線</a> ``` css ```css a { font-size: 1rem; font-weight: 300; } .link2 { text-decoration: none; } .link3:hover { color: tomato; transition: color 3s; /*漸變顏色,3秒後變紅*/ text-decoration: none; } ``` <a href="#" class="link1">預設連結樣式</a> <a href="#" class="link2">沒有底線的連結</a> <a href="#" class="link3">滑鼠移過去會改變顏色,消除底線</a> <style> a { font-size: 1rem; font-weight: 300;} .link2 { text-decoration: none; } .link3:hover { color: tomato; background-color: wheat; text-decoration: none; transition: color 3s; } </style> # box-shadow: 陰影效果 html ```htmlmixed <div id="shadow">shadow</div> ``` css ```css div#shadow { width: 200px; height: 200px; color:whitesmoke; background-color:teal; font-size: 3rem; font-weight: 300; font-family: sans-serif; box-shadow: /*參數: 右 下 模糊效果 顏色(可加不透明度) */ 10px 2px 20px rgba(0, 0, 0, 0.5), /*另一組用逗點隔開: 左 上 模糊效果 顏色*/ -5px -5px 10px wheat; } ``` # css簡寫順序 1. 簡寫的順序:有的排序很重要(如margin),有的排序不重要(如border)。 2. 未指名的值會被設為預設值。 html ```htmlmixed <div id="margin">margin</div> ``` css ```css div#margin { width: 200px; height: 200px; color:whitesmoke; background-color:teal; font-size: 2rem; font-weight: 300; font-family: sans-serif; /*border可以調換順序*/ border: 10px solid lightblue; /*border: lightblue 10px solid;*/ border-color: green; /*放後面的設定會蓋掉前面*/ margin: 1px 2px 2px 1px; } ``` <div id="margin">margin</div> <style> div#margin { width: 200px; height: 200px; color:whitesmoke; background-color:teal; font-size: 2rem; font-weight: 300; font-family: sans-serif; /*border可以調換順序*/ border: 10px solid lightblue; /*border: lightblue 10px solid;*/ border-color: green; /*放後面的設定會蓋掉前面*/ margin: 1px 2px 2px 1px; } </style>

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