* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

.container {
    width: 100%;
    height: 100vh;
    background-color: black;
    display: flex;
    justify-content: center;
    align-items: center;
}

.calculator {
    background-color: white;
    border-radius: 10px;
    padding: 20px;
}

.calculator form input {
    width: 65px;
    height: 60px;
    font-size: 30px;
    background-color: transparent;
    color: black;
    box-shadow: rgba(99, 99, 99, 0.2) 0px 2px 8px 0px;
    border: 0;
    outline: 0;
    margin: 10px;
}

form .display {
    display: flex;
    justify-content: flex-end;
    margin: 20px 0;
}

form .display input {
    text-align: right;
    box-shadow: none;
    flex: 1;
    font-size: 45px;
}

.h2 {
    font-size: 20px;
    text-align: left;
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
}

form input.equal {
    width: 145px;
}

form input.operator {   
    color: rgba(9, 150, 150);
}