form-controlclass to the input
                                    disabledto disable input field.
                                    value="VALUE"to set predefined value.
                                    readonlyto set field readonly.
                                    placeholder="..."to input area.
                                    maxlength="6"to input area.
                                    minlength="5"to input area.
                                    input type="text"
                                    input type="password"
                                    input type="tel"
                                    input type="email"
                                    input type="url"
                                    input type="search"
                                    input type="number"
                                    input type="datetime-local"
                                    input type="date"
                                    input type="time"
                                    input type="week"
                                    input type="month"
                                    input type="color"
                                    input type="range"
                                    .custom-selectclass
                                    multipleto the field
                                    .input-group-prependclass to the div
                                    .input-group-appendclass to the div
                                    .form-control-fileclass to the input
                                    .custom-file-inputclass to the input
                                    .input-group-prependclass to the div
                                    .input-group-appendclass to the div
                                    float-leftclass to the text
                                    text-centerclass to the text
                                    float-rightclass to the text
                                    is-validclass to the input
                                    is-invalid class to the input
                                    form-horizontalclass to the input
                                    form-horizontal class to the input