#hovertreetags {
    position: relative;
    font-size: 12px;
    color: #333;
    margin: 20px auto 0;
    text-align: center;
    border: 1px solid silver;
}

    #hovertreetags a {
        position: absolute;
        top: 0px;
        left: 0px;
        color: #333;
        font-family: Arial;
        text-decoration: none;
        margin: 0 16px 10px 0;
        line-height: 18px;
        text-align: center;
        font-size: 12px;
        padding: 1px 5px;
        display: inline-block;
        border-radius: 3px;
    }

        #hovertreetags a:nth-child(3n+1) {
            background: #666;
            color: #fff;
        }

        #hovertreetags a:nth-child(3n+2) {
            background: #F16E50;
            color: #fff;
        }

        #hovertreetags a:nth-child(3n+3) {
            background: #006633;
            color: #fff;
        }

        #hovertreetags a:hover {
            color: #fff;
            background: #0099ff;
        }