/*     
    <main>
        <div class="display-container">
            <div class="display">
                <p class="display-text">0</p>
            </div>
        </div>
        <div class="calculator-container">
            <button class="number" id="number" data-value="0">0</button>
            <button class="number" id="number" data-value="1">1</button>
            <button class="number" id="number" data-value="2">2</button>
            <button class="number" id="number" data-value="3">3</button>
            <button class="number" id="number" data-value="4">4</button>
            <button class="number" id="number" data-value="5">5</button>
            <button class="number" id="number" data-value="6">6</button>
            <button class="number" id="number" data-value="7">7</button>
            <button class="number" id="number" data-value="8">8</button>
            <button class="number" id="number" data-value="9">9</button>
            <button class="operator" id="operator" data-value="+">+</button>
            <button class="operator" id="operator" data-value="-">-</button>
            <button class="operator" id="operator" data-value="*">*</button>
            <button class="operator" id="operator" data-value="/">/</button>
            <button class="operator" id="operator" data-value="=">=</button>
            <button class="operator" id="operator" data-value="C">C</button>
        </div>
    </main>
*/
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

.display-container {
    width: 300px;
    height: 100px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    margin-bottom: 20px;
}

.display {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 0 20px;
    flex-direction: column;
}

.screen-current {
    font-size: 20px;
    font-weight: 700;
    padding: 10px 4px 0px 0px;
}

.screen-last {
    font-size: 12px;
    font-weight: 400;
}

.calculator-container {
    width: 300px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 10px;
}

.btn {
    width: 100%;
    height: 50px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    border: none;
    outline: none;
    font-size: 20px;
    font-weight: 700;
    cursor: pointer;
}