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3. 背景属性 1. background-color 2. background-image 4. 边框属性 1. border 2. border-radius --> 变圆 5. display属性 1. inline 2. block 3. inline-block 4. none (隐藏) 6. CSS盒子模型(从外到内) 1. margin: 边框之外的距离(多用来调整 标签和标签之间的距离) 2. border边框 3. padding:内容区和边框之间的距离(内填充/内边距) 4. condent: 内容 7. 浮动: div配合float 来做 页面的布局 任何元素浮动之后都会变成块元素 float: 1. left 2. right 3. none 8. 清除浮动(清除的是浮动带来的负面效果-->父标签塌陷(撑不起来)) 1. clear 1. left 2. right 3. both 最常和伪元素结合起来应用: .clearfix:after { content: ""; display: block; clear: both } 9. 定位: 1. static --> 默认的 2. relative --> 相对定位(相对于原来的位置来说) 3. absolute --> 绝对定位(相对于最近的一个被定位过的祖宗标签) (完全脱离文档流) 4. fixed --> 固定在某个位置(返回顶部按钮) left right top bottom