.numpad-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .5em;
}

.numpad-display {
    font-size: 2em;
}

.numpad-btn-panel {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-auto-rows: 1fr;
    gap: .5em;
}

.numpad-btn-panel > button {
    height: 3em;
    width: 3em;
    border: 2px solid #666;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5em;
    background-color: white;
    color: #222;
    appearance: none;
}

.numpad-wrapper :is(button:hover, button:focus) {
    background-color: rgb(245, 245, 245);
}

 .numpad-wrapper button:active {
    background-color: rgb(200, 200, 200);
}

.numpad-wrapper button img {
    height: .8em;
    vertical-align: middle;
}