#auth_otp {
    flex-wrap: nowrap;
    overflow-x: auto;
}

    #auth_otp input.form-control {
        flex: 0 0 12%;
        max-width: 20%;
        font-size: 16px;
        color: black;
        padding: 10px;
    }

    /* For Webkit browsers like Chrome, Safari */
    #auth_otp input[type="number"]::-webkit-inner-spin-button,
    #auth_otp input[type="number"]::-webkit-outer-spin-button {
        -webkit-appearance: none;
        margin: 0;
    }

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