.calc {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

button {
    width: 210px;
    height: 210px;
    text-align: center;
    margin-right: 8px;
    margin-bottom: 13px;
    font-size: 90px;
    font-weight: 400;
    border-radius: 500px;
    border: none;
    color: #ffffff;
    background-color: #2a2a2c;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

button:hover {
    background-color: #444444;
}

button.op {
    background-color: #ff9f0a;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

button.op:hover {
    background-color: #ffb340;
}

button.top {
    background-color: #5c5c5f;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

button.top:hover {
    background-color: #7d7d7f;
}

#inputField {
    width: 870px;
    height: 150px;
    font-size: 100px;
    text-align: right;
    background-color: #000000;
    border: none;
    color: #ffffff;
    font-weight: 500;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #000000;
    color: #ffffff;
}