CSS3学习笔记(4)-CSS3函数

<style><!--
.col-3{
width: calc(100%/3 - 6px);
float: left;
margin-right: calc(6px*3 /2);
background: #fff;
color: #333;
height: 100px;
text-align: center;
margin-bottom: calc(6px*3 /2);
font-size: 18px;
line-height: 100px;
box-shadow:0 0 10px;
}
.col-3:nth-child(3){
margin-right: 0;
}
.container{
overflow:hidden;
}
.alexrootdiv{
font-family: 微软雅黑;
margin: 0;
padding: 0;
}
.alexrootdiv>p{
font-size: 15px; text-indent: 2em;
}
.alexrootdiv>div{
background: #eeeeee; border: 1px solid #aaa;
width: 99%; padding: 5px; margin: 1em 0 1em 0;
}
.alexrootdiv>div>p:first-of-type,.alextitlep{
font-size: 18px; font-weight: bold; color: red;
}
.alexrootdiv span{
color:blue;font-weight:bold;
}
.alexrootdiv table{
margin-top:10px;border-collapse:collapse;
border:1px solid #aaa;width:100%;
}
.alexrootdiv table th{
vertical-align:baseline;padding:5px 15px 5px 6px;
background-color:#d5d5d5;border:1px solid #aaa;text-align:left;
}
.alexrootdiv table td{
vertical-align:text-top;padding:6px 15px 6px 6px;
background-color:#efefef;border:1px solid #aaa;
}
.attentationp{
font-size: 15px; text-indent: 2em;
background: #ee0; color: red; font-weight: bold;
}
--></style>
<div class="alexrootdiv">
<div class="container">
<div class="col-3">1</div>
<div class="col-3">2</div>
<div class="col-3">3</div>
<div class="col-3">4</div>
</div>
</div>