.calculator, .notepad {
    border: none;
    padding: 10px;
    margin-top: 10px;
}
.notepad::placeholder {
    color: red;
    opacity: 1;
}

/* 계산기 버튼 간격 조정 */
.row.g-3 {
    row-gap: 0.75rem !important;
    column-gap: 0.75rem !important;
}

.row.g-3 .btn {
    padding: 0.75rem 0.5rem !important;
}