.wrapper{
    width: 1000px;
    margin: 20px auto;
}
.box{
    width: 100px; 
    height: 100px; 
    margin: 0px 10px 10px 0px;
    float: left;
    background-color: #ddd;
}
.box a{
    text-decoration: none;
    vertical-align: middle;
    text-align: center;
    display: block;
    line-height: 100px;
    color: #000;
}