#calculator {
    border: 1px solid rgb(213, 213, 210);
    border-radius:  3px;
    width: 200px;
    height: 380px;
}
#display {
    margin: 10px;
    width: 85%;
    height: 30px;
    font-size: 25px;
}
.button{
    width: 45px;
    height: 45px;
    margin: 3px;
}
.button-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}