a.btn i.right::before {
    margin: 0 0 0 6px;
}

a.btn span.text + i.icon::before {
    display: inline-block;
    margin: 0 6px 0 0;
    min-width: 16px;
}

a.btn  i.icon::before {
    display: inline-block;
    margin: 0px;
    min-width: 14px;
}

.btn-group > a.btn > i.left::before, .input-group-addon + a.btn > i.left::before {
    margin: 0px -7px 0px 0px;
}