.btn { 
    padding:6px 12px; 
    margin-left:5px; 
    border:none; 
    border-radius:4px; 
    cursor:pointer; 
}

.btn-save { background:#28a745; color:#fff; }
.btn-cancel { background:#dc3545; color:#fff; }
.btn-add { background:#007bff; color:#fff; }
.btn-del { background:#dc3545; color:#fff; }