.math-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 0.3125rem;
    margin-top: 10%;
    place-items: center;
}

.math-button {
    width: 10rem;
    height: 10rem;
    border: none;
    background-color: #e0e0e0;
    cursor: pointer;
    font-size: 1.125rem;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    border-radius: 0.3125rem;
}

/* Mobile responsiveness */
@media (max-width: 1440px) {
    .math-buttons {
        gap: 0.475rem;
    }
    .math-button {
        width: 9.5rem;
        height: 9.5rem;
        font-size: 1.0625rem;
    }
}

@media (max-width: 1024px) {
    .math-buttons {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.45rem;
    }
    .math-button {
        width: 9rem;
        height: 9rem;
        font-size: 1rem;
    }
}

@media (max-width: 768px) {
    .math-buttons {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.3rem;
        margin-top: 5%;
    }

    .math-button {
        width: 8rem;
        height: 8rem;
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .math-buttons {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .math-button {
        width: 12rem;
        height: 12rem;
        font-size: 1rem;
    }
}

@media (max-width: 375px) {
    .math-buttons {
        gap: 0.4rem;
    }
    .math-button {
        width: 10rem;
        height: 10rem;
        font-size: 0.9375rem;
    }
}