body {
    display: flex;
    justify-content: center;
    align-items: center;
    background: #151516;
    margin: 0;
}

.calculator {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    height: 100vh;
    background: #151516;
    color: #fff;
    padding: 10px;
    box-sizing: border-box;
    width: 50%;
}

.display {
    padding: 20px;
    font-size: 24px;
    background: #1e1e20;
    border-radius: 40px;
    border: none;
    box-sizing: border-box;
    text-align: end;
    height: 100px;
    overflow-x: auto;
    white-space: nowrap;
}

.display:disabled {
    color: white;
}

.buttons {
    display: flex;
    flex-wrap: wrap;
    flex-flow: column;
    justify-content: center;
    margin-top: 10px;
}

.button-row {
    display: flex;
    justify-content: center;
}

button {
    background: #28282b;
    border: none;
    color: white;
    font-size: 24px;
    height: 80px;
    width: 80px;
    margin: 4px;
    padding: 0;
    border-radius: 40px;
    outline: none;
    user-select: none;
}

button:active {
    opacity: 0.8;
}

button:hover {
    background-color: #777;
    cursor: pointer;
}