:root {
    --darkest-font: #46425e;
    --header-footer-bg: #15788c;
    --lightest-font: #ffeecc;
    --accent-color: #00b9be;
    --secondary-accent: #ff6973;
}

.content-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.calculator {
    background-color: var(--header-footer-bg);
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    padding: 20px;
    width: 100%;
    max-width: 400px;
}

.display {
    background-color: lightgray;
    border-radius: 5px;
    height: 50px;
    width: 100%;
    text-align: right;
    padding: 10px;
    font-size: 24px;
    margin-bottom: 10px;
}

.buttonContainer {
    display: flex;
    flex-direction: column;
    width: 100%;
}

.buttonsRow {
    display: flex;
    justify-content: space-between;
    width: 100%;
}

button {
    flex: 1;
    margin: 5px;
    padding: 15px;
    font-size: 18px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: var(--accent-color);
}

.functionButton {
    background-color: var(--secondary-accent);
}

.operatorButton {
    background-color: lightgreen;
}

.numberButton {
    background-color: var(--lightest-font);
}

@media (max-width: 600px) {
    .display {
        font-size: 20px;
    }

    button {
        padding: 10px;
        font-size: 16px;
    }
}

@media (max-width: 400px) {
    .display {
        font-size: 18px;
    }

    button {
        padding: 8px;
        font-size: 14px;
    }
}