相关疑难解决方法(0)

我有这个布局:

<div id="sectors">
    <h1>Sectors</h1>
    <div id="s7-1103" class="alpha"></div>
    <div id="s8-1104" class="alpha"></div>
    <div id="s1-7605" class="beta"></div>
    <div id="s0-7479"></div>
    <div id="s2-6528" class="gamma"></div>
    <div id="s0-4444"></div>
</div>

使用这些CSS规则:

#sectors {
    width: 584px;
    background-color: #ffd;
    margin: 1.5em;
    border: 4px dashed #000;
    padding: 16px;
    overflow: auto;
}

#sectors > h1 {
    font-size: 2em;
    font-weight: bold;
    text-align: center;
}

#sectors > div {
    float: left;
    position: relative;
    width: 180px;
    height: 240px;
    margin: 16px 0 0 16px;
    border-style: solid;
    border-width: 2px;
}

#sectors > div::after {
    display: block;
    position: absolute; …