CSS属性书写顺序

/* Positioning */
position: absolute;
top:0;
right:0;
bottom:0;
left:0;
z-index:100;
/* Box-model */
display: block;
float: right;
width:100px;
height:100px;
/* Typography */
font: normal 13px"Helvetica Neue", sans-serif;
line-height:1.5;
color:#333;
text-align: center;
/* Visual */
background-color:#f5f5f5;
border:1px solid #e5e5e5;
border-radius:3px;
/* Misc */
opacity:1;