Always show up/down arrows for input "number"
HTML
<input type="number" value="1" min="1" max="999">
CSS
input[type=number]::-webkit-inner-spin-button {
opacity: 1
}
<input type="number" value="1" min="1" max="999">
input[type=number]::-webkit-inner-spin-button {
opacity: 1
}