body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.calculator {
    display: flex;
    align-items: center;
    gap: 10px;
}

.calculator input {
    width: 150px;
    height: 30px;
    text-align: center;
    background-color: #eeeeee;
    font-size: 20px;
    border-radius: 8px;
}

.calculator span {
    font-size: 24px;
}

.calculator button {
    height: 40px;
    padding: 0 20px;
    font-size: 16px;
    cursor: pointer;
    background-color: #eeeeee;
    border-radius: 8px;
}