相关属性应为一组,推荐的样式编写顺序

Positioning(定位)
Box model(盒子模型)
Typographic(排版)
Visual(视觉效果,如动画颜色等)
other(其他)

/* Positioning */
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
z-index: 100;

/* Box model */
display: block;
box-sizing: border-box;
width: 100px;
height: 100px;
padding: 10px;
border: 1px solid #e5e5e5;
border-radius: 3px;
margin: 10px;
float: right;
overflow: hidden;

/* Typographic */
font: normal 13px "Helvetica Neue", sans-serif;
line-height: 1.5;
text-align: center;

/* Visual */
background-color: #f5f5f5;
color: #fff;
opacity: .8;

/* Other */
cursor: pointer;