.btn-xs {
    padding: 0.1rem 0.3rem;
    font-size: 0.7rem;
    line-height: 1.1;
}
.btn-sm {
    padding: 0.15rem 0.35rem; /* smaller padding */
    font-size: 0.75rem;       /* smaller text */
    line-height: 1.2;
}