*{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    box-sizing: border-box;
}
.container{
    width: 100%;
    height: 100vh;
    background: #8c8d8e;
    display: flex;
    align-items: center;
    justify-content: center;
}
.calculator{
    background: #000000;
    padding: 20px;
    border-radius: 8px;
}
.calculator form input{
    border: 0;
    width: 60px;
    height: 60px;
    border-radius: 10px;
    box-shadow: -8px -8px 15px rgba(255, 255, 255, 0.1), 5px 5px 15px rgba(255, 255, 255, 0.2);
    background: transparent;
    font-size: 20px;
    color: #fff;
    cursor: pointer;
    margin: 10px;
}
.calculator form input:hover{
    background-color: #00ff22;
    color: black;
}
form .display{
    display: flex;
    margin: 20px 0;
}
form .display input{
    text-align: right;
    flex: 1;
    font-size: 40px;
    border: 4px solid #00ff22;
}
form .display input:hover{

    border: 4px solid white;
}
form input.equal{
    width: 145px;
    color: rgb(0, 255, 132);
}
form input.operator{
    color: rgb(0, 255, 89);
}