.nav-pills > li{
    float: none;
    display: inline-block;
    zoom: 1;
}
.nav-pills{
    text-align: center;
    margin: 30px;
}
.alert{
    text-align: center;
    margin-bottom: 0!important;
}
.add_column{
    margin: 22px;
    margin-right: 0;
}
.delete_column{
    margin: 22px;
}
.divide{
    border-top: 1px solid grey;
    width: 100%;
    margin-top: 15px;
    margin-bottom: 30px;
}
#add_column{
    margin-top: 15px;
    margin-bottom: 30px;
}