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    <style>
        * {
            margin: 0;
            padding: 0;
        }
        .box {
            padding: 5px 0 0 5px;
            background-color: blue;
            overflow: hidden;
            width: 165px;
            height: 165px;
            margin: 0 auto;
        }
        ul {
            width: 200px;
        }
        .box li {
            float: left;
            width: 50px;
            height: 50px;
            line-height: 50px;
            text-align: center;
            margin-right: 5px;
            margin-bottom: 5px;
            list-style: none;
            background-color: #fff;
            position: relative;
        }
        a {
            text-decoration: none;
        }

        .text {
            position: absolute;
            left: 0;
            top: 0;
            z-index: 2;
            width: 100%;
            height: 100%;
            background-color: #fff;
        }
        .helper {
            position: absolute;
            left: 0;
            top: 0;
            width: 60px;
            height: 60px;
            margin-top: -5px;
            margin-left: -5px;
        }
        a:hover .helper {
            background: red;
            z-index: 1;
        }
    </style>
    <div class="box">
        <ul>
            <li><a href=""><span class="helper"></span><span class="text">1</span></a></li>
            <li><a href=""><span class="helper"></span><span class="text">2</span></a></li>
            <li><a href=""><span class="helper"></span><span class="text">3</span></a></li>
            <li><a href=""><span class="helper"></span><span class="text">4</span></a></li>
            <li><a href=""><span class="helper"></span><span class="text">5</span></a></li>
            <li><a href=""><span class="helper"></span><span class="text">6</span></a></li>
            <li><a href=""><span class="helper"></span><span class="text">7</span></a></li>
            <li><a href=""><span class="helper"></span><span class="text">8</span></a></li>
            <li><a href=""><span class="helper"></span><span class="text">9</span></a></li>
        </ul>
    </div>