body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background: #3802fa;
}

.calculadora {
    width: 300px;
    padding: 20px;
    border-radius: 15px;
    background: rgb(0, 145, 202);
    box-shadow: 0 5px 20px rgba(255, 254, 254, 0.2);
}

#pantalla {
    width: 100%;
    height: 60px;
    font-size: 25px;
    text-align: right;
    margin-bottom: 15px;
    box-sizing: border-box;
}

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

button {
    height: 55px;
    font-size: 20px;
    cursor: pointer;
    border: none;
    border-radius: 8px;
}

#igual {
    grid-column: span 3;
}