.scientific .calc-buttons {
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: 50px;
}

.scientific .btn {
    font-size: 16px;
    padding: 12px;
}

.scientific .btn.tall {
    grid-row: span 2;
}

.scientific .btn.wide {
    grid-column: span 2;
}