.calculator {
    max-width: 400px;
    margin: 0 auto;
    flex-direction: column;
    align-items: center;
}

.calculator label {
    margin-bottom: 0px;
}

.calculator input {
    width: 100%;
    padding: 4px;
    margin-bottom: 0px;
	text-align: center;
}

.calculator button {
    width: 100%;
    margin-top: 10px;
    background-color: #007bff;
    color: #fff;
    border: none;
}