.db-calculator-form{margin:20px 0;padding:15px;border:1px solid #ddd;border-radius:4px;background-color:#fff}.calculation-result{margin-top:15px;padding:10px;background-color:#f9f9f9;border-radius:4px;min-height:20px}.error{color:#721c24;background-color:#f8d7da;border:1px solid #f5c6cb;padding:10px;border-radius:4px;margin:10px 0}.button-primary{background-color:#0073aa;border-color:#0073aa;color:#fff;text-decoration:none;text-shadow:none;padding:5px 15px;border-radius:3px;cursor:pointer}.button-primary:hover{background-color:#006799;border-color:#006799}