CSS的本质可以分为宏观与微观两方面。 宏观上它的存在就是为了控制页面的显示样式。包括布局，颜色，字体等。微观上则是实现这种控制功能的各种属性的定义和工作原理。
了解定义就能干活，知道原理才能把活干好。
题主说属性太多，其实CSS就是去控制样式而已，网页样式是借鉴于传统的报纸等印刷品的排版。你随便在身边找一份报纸或者杂志的一页，用CSS尽可能的还原出来。整体布局还原出来问题应该不大，但是具体到细节的时候可能会有很多问题，比如出来的效果总是跟想的不一样。这个时候就该去看看单个属性的工作原理，比如margin是用来控制外边距的但是用%的时候它是怎么计算的最终值呢？当发现出乎意料的时候就去查一下属性的定义和值的计算方法。
常用基础样式如图：
Tips：
常用CSS属性margin和padding的%取值是基于包含块（离元素最近的块级祖先元素）的宽,注意是宽。
行内元素相关的内容区、行内框、基线这几个概念很重要。
inline-block是，内部被解析为块级元素，自身被解析为行内元素。
background-image可以同时为一个元素设置多个背景图配合background-position可以组合出神奇的效果。
浮动的元素会消除外边距重合，浮动的元素会被解析为块级元素。
top,right,bottom,left,z-index这些属性只有用在定位元素(除了position为static值)上才有效。
overflow的值设置为scroll，在移动端可以做横向滑动效果。
除了做表格不要用table布局。
作者：韩双力
链接：https://www.zhihu.com/question/31317160/answer/85833065
来源：知乎
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