body {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: black;
}

#calculator-body {
    background-color: #DCDCDC;
    width: 50%;
    height: 100%;
}

#display-box {
    text-align: right;
    background-color: white;
    font-size: 36px;
    margin: 20px
}

#input-grid {
    margin: 20px;
    margin-top: 50px;
    display: grid;
    grid-template-columns: auto auto auto auto;
}

#input-grid > button {
    background-color: white;
    font-size: 36px;
    margin: 10px;
    border-radius: 5px;
}