CSS3学习笔记(4)-CSS3函数

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<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>