*{
    margin: 0;
    padding: 0;
    font-family: 'poppins', sans-serif;
    box-sizing: border-box;
}

.container{
    align-items: center;
    justify-content: center;
    display: flex;
    background-color:rgb(65, 54, 54);
    width: 100%;
    height: 100vh;
   
}

.calculator{
    border: 2px solid black;
    box-shadow: -8px -8px 15px black,
                 5px 5px 15px black;
    background-color: rgb(90, 85, 85);
    padding: 20px;
    border-radius: 10px;
    border-style: outset;
}

.calculator form input{
    border: 0;
    width: 60px;
    height: 60px;
    border-radius: 20px;
    box-shadow: -4px -4px 10px black,
                 5px 5px 15px black;
    background: transparent;
    font-size: 30px;
    color: aliceblue;
    cursor: pointer;
    margin: 10px;
}
form .display{
    display: flex;
    justify-content: flex-end;
    margin: 20px 0;
}

form input.operator{
    color: rgb(84, 190, 154);
    background-color: rgb(144, 69, 69);
}

.calculator form input:active{
    background-color: rgb(75, 75, 84);
    /* color: aliceblue; */
} 

form .display input{
    text-align: right;
    flex: 1;
    font-size: 40px;
    box-shadow: none;
    text-decoration: none;
}