body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #000;
    margin: 0;
    font-family: Arial, sans-serif;
}

.calculator {
    background-color: #000;
    padding: 20px;
    border-radius: 20px;
    /* Sombra mais marcada para simular um contorno */
    box-shadow: 0 0 20px rgb(0, 0, 0), 0 0 40px rgba(255, 255, 255, 0.2);
    text-align: center;
    width: 320px;
}

.logo {
    margin-bottom: 20px;
}

.display {
    background-color: #222;
    color: #fff;
    font-size: 2em;
    padding: 10px;
    border-radius: 10px;
    margin-bottom: 20px;
    min-height: 50px;
    text-align: right;
}

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

.button {
    border: none;
    border-radius: 50%;
    padding: 20px;
    font-size: 1.5em;
    cursor: pointer;
}

.button.dark-gray {
    background-color: #333;
    color: #fff;
}

.button.orange {
    background-color: #00c3ff;
    color: #fff;
}

.button.light-gray {
    background-color: #d3d3d3;
    color: #000;
}

.button.wide {
    grid-column: span 2;
    border-radius: 50px;
}

.button:active {
    opacity: 0.8;
}