.btn {
    /* No rounded corners. Mark as important so btn-group doesn't override */
    border-radius: 0 !important;
    /* force capitalization */
    text-transform: capitalize;
}

.btn:not(.btn-success) {
    /* No rounded corners. Mark as important so btn-group doesn't override */
    border-radius: 0 !important;
    /* Default button colour is black */
    background-color: #222;
    /* Text colour needs to be white */
    color: #eee;
    /* force capitalization */
    text-transform: capitalize;
}

.btn:hover {
    /* show the user a pointer to indicate clicking */
    cursor: pointer;
    /* slightly lighten the background colour */
    opacity: 0.75;
    /* slightly darken the text colour */
    color: #ddd;
}