.div1{
    width: 100%;
    height: 100vh;
    background-color: lightslategray;
    display: flex;
    align-items: center;
    justify-content: center;

}
.calculator{
    background-color: burlywood;
    padding: 20px;
    border-radius: 10px;
}

.calculator form input{
    margin: 2px;
    border: 0;
width: 40px;
height: 40px;
font-size:large;
background-color: blanchedalmond;
color: brown;
text-shadow: black;
border-radius: 10px;
cursor: pointer;
}
.calculator form .display{
    width: 180px;
    text-align: right;

}
.calculator form .ac{
    width:87px;
}