*{
    background-color: #51585a;
}
.container{
    margin-top: 5%;
    height: 100%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}
.calculator{
   background: #414749;
   padding: 20px;
   border-radius: 10px;
}
.container form input{
    border: 0;
    outline: 0;
    width: 60px;
    height: 60px;
    border-radius: 10px;
    box-shadow: -8px -8px 15px rgba(255, 255, 255, 0.1) , 5px 5px 15px rgba(0, 0, 0, 0.2) ;
    background: transparent;
    font-size: 20px;
    color: white;
    cursor: pointer;
    margin: 10px;
}
form .screen{
display: flex;
justify-content: flex-end;
margin: 20px 0px;
}
form .screen input{
    text-align: right;
    flex: 1;
    font-size: 45px;
}
form input.equal{
    width: 145px;
}
form input.operater{
    color: black;
}