#calculator{
    width: 270px;
    background-color: rgb(66, 61, 61);
    border-radius: 10px;
    margin-left: 15%;
    margin-top: 10%;

}



#key{
    width: 270px;
    display: flex;
    flex-wrap: wrap;

}
button{
    margin: 20px;
    background-color: gray;
    border-radius: 50px;
    font-size: 25px;
    border: none;
    text-align: center;
    color: white;
    


}
#display{
    width: 228px;
background-color: rgb(83, 81, 81);
font-size: 25px;
padding: 20px;
border-radius: 10px;
color: white;
}
.operating{
    background-color: orange;
}