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

.container {
    width: 100%;
    height: 100vh;
    background: #e3f9ff;
    display: flex;
    align-items: center;
    justify-content: center;
}

h1 {
    color: #fff;
    font-family: sans-serif;
    font-size: 20px;
}

.calculator {
    background: #455162;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 17px 12px 12px rgb(144, 139, 139);
}

.calculator 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: #fff;
    cursor: pointer;
    margin: 10px;
}

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

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

form input.equal {
    width: 140px;
}

form input.operator {
    color: rgb(36, 190, 190);
}