input[type=number] {
    -moz-appearance: textfield;
}

/* Chrome */
input::-webkit-inner-spin-button,
input::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin:0;
}

/* Opéra*/
input::-o-inner-spin-button,
input::-o-outer-spin-button {
    -o-appearance: none;
    margin:0
}