<!DOCTYPE html>
<html>
<head>
<style>
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
-webkit-appearance: none;
margin: 0;
}
input[type=number] {
-moz-appearance: textfield;
/* Firefox */
}
</style>
</head>
<body>
<input type="number" />
</body>
</html>