.content nav ul{
    display: inline-block;
}
.content nav ul li > a{
    text-align: center;
    width: 2.5rem;
    /*height: 100%;*/
    /*padding: 0px 17px;*/
    padding: 0;
}
.active {
    display: inline-block;
    background-color: #ccc
}
.content nav ul li {
    display: inline-block;
    text-align: center;
    width: 2.5rem;
    margin-bottom: 10px;
    padding: 0px;
    /*width: 2.75rem;*/
    border: 1px solid #ddd;
}