Is it possible to conceal the spin box of the HTML5 number input?

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Yes, it is possible to conceal the spin box of the HTML5 number input using CSS. Here's how:

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="number"] {
  -moz-appearance: textfield; /* Firefox */
}

This CSS code will hide the spin box in Chrome, Safari, and other WebKit-based browsers. The spin box will still be visible in Firefox, but the -moz-appearance: textfield; rule will make it look like a regular text input.