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

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

.calculator {
    background: #3a4452;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 8px 8px 15px rgba(0, 0, 0, 0.3);
    text-align: center;
}

.calculator form input {
    border: none;
    outline: none;
    width: 60px;
    height: 60px;
    border-radius: 10px;
    box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.3);
    font-size: 20px;
    background: #2d3642;
    color: #fff;
    cursor: pointer;
    margin: 5px;
}

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

form .display input {
    text-align: right;
    flex: 1;
    font-size: 35px;
    padding: 10px;
    background: #fff;
    color: #000;
    border-radius: 5px;
}

.calculator div {
    display: flex;
    justify-content: space-between;
}

form input.equal {
    width: 135px;
    background: #ff9800;
    color: white;
}

form input.equal:hover {
    background: #e68900;
}

.calculator input:hover {
    background: #505a6b;
}