*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    
}
body{
    background: black;
}
.container{
    margin-top: 100px;
    display: flex;
    justify-content: center;
}
.calculadora{
    width: 400px;
    height: 600px;
    background-color: #615756;
    display: grid;
    grid-template-columns: repeat(4,80px);
    grid-template-rows: 130px repeat(6,80px) ;
    justify-content: center;
    border-radius: 20px;
    padding-top:20px ;
}
.calculadora button{
    font-size: 1.5rem;
    background-color: #539987;
    border-radius: 50%;
    border: 2px #333333 solid;
    margin: 3px;
}

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

.span2{
    grid-column: span 2;
}

.valor-superior{
    color: white;
    font-size: 1.2rem;
    margin-bottom: 30px;
}

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