whmcsCrosterTemplates/includes/generate-password.tpl

<form action="#" id="frmGeneratePassword">
    <div class="modal fade" id="modalGeneratePassword">
        <div class="modal-dialog modal-dialog-centered">
            <div class="modal-content">
                <div class="modal-header d-block">
                    <h5 class="modal-title m-0">
						<button type="button" class="close" data-dismiss="modal" aria-label="Close">
							<span aria-hidden="true">&times;</span>
						</button>
                        {lang key='generatePassword.title'}
                    </h5>
                </div>
                <div class="modal-body">
                    <div class="alert alert-danger w-hidden" id="generatePwLengthError">
                        {lang key='generatePassword.lengthValidationError'}
                    </div>
                    <div class="form-group row mb-2">
                        <label for="generatePwLength" class="col-md-4 mb-0">{lang key='generatePassword.pwLength'}</label>
                        <div class="col-md-8">
                            <input type="number" min="8" max="64" value="12" step="1" class="form-control input-inline input-inline-100" id="inputGeneratePasswordLength">
                        </div>
                    </div>
                    <div class="form-group row mb-2">
                        <label for="generatePwOutput" class="col-md-4 mb-0">{lang key='generatePassword.generatedPw'}</label>
                        <div class="col-md-8">
                            <input type="text" class="form-control" id="inputGeneratePasswordOutput">
                        </div>
                    </div>
                    <div class="row">
                        <div class="col-md-8 offset-md-4">
                            <button type="submit" class="btn btn-default btn-sm">
                                <i class="fas fa-plus fa-fw"></i>
                                {lang key='generatePassword.generateNew'}
                            </button><br />
                            <button type="button" class="btn btn-default btn-sm copy-to-clipboard mt-2" data-clipboard-target="#inputGeneratePasswordOutput">
                                <img src="{$WEB_ROOT}/assets/img/clippy.svg" alt="Copy to clipboard" width="15">
                                {lang key='copy'}
                            </button>
                        </div>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-default" data-dismiss="modal">
                        {lang key='close'}
                    </button>
                    <button type="button" class="btn btn-primary" id="btnGeneratePasswordInsert" data-clipboard-target="#inputGeneratePasswordOutput">
                        {lang key='generatePassword.copyAndInsert'}
                    </button>
                </div>
            </div>
        </div>
    </div>
</form>