* {
    box-sizing: border-box;
    margin:0;
    padding: 0;
}


.container {
    display: flex;
    justify-content: center;
}
.calculadora {
    width: 400px;
    height: 600px;
    background-color: #1a054d;
    display: grid;
    grid-template-columns: repeat(4,80px);
    grid-template-rows: 130px repeat(6,80px);
    justify-content: center;
    border-radius: 20px;
    padding-top: 20px;
    font-family: Arial, Helvetica, sans-serif;

}

.calculadora button {
    font-size: 1.5rem;
    background-color: #997253;
    border-radius: 50%;
    border: 2px #333333 solid;
    margin:2px;

}

.calculadora button:hover {
    background-color: silver;
}


.display {
    height: 120px;
    background-color: #344055;
    opacity: .7;
    grid-column: 1/-1;
    border: 2px #333333 solid;
    text-align: end;
    padding: 10px 0;
   

}

.span2 {
    grid-column: span 2;
}
.valor-superior {
    color: white;
    font-size: 1.2rem;
    margin-bottom: 30px;

}

.valor-inferior {
    color: white;
    font-size: 2rem;

}