Sass :

    /*Убираем стрелочки с input type number*/
    input[type=number],//other
    input[type="number"]{
        /*chrome*/
        &::-webkit-outer-spin-button,
        &::-webkit-inner-spin-button {
            -webkit-appearance: none;
            margin: 0;
        }
        /*firefox*/
        -moz-appearance: textfield;
        &:hover,
            input[type="number"]:focus {
            -moz-appearance: number-input;
        }

    }