odoo-survey-addons/survey_input_template_custom/models/survey_survey.py

from odoo import models, fields, api, _


class SurveySurvey(models.Model):
    _inherit = 'survey.survey'

    @api.model
    def _get_default_style(self):
        return _("""/* Background (start and thank you) */
/* .jumbotron {
  background-color: #e9ecef;
} */

/* Titles (survey and pages) */
/* h1 {} */
/* Descriptions (survey and pages) */
/* p {} */

/* Questions (title) */
/* h2 {} */
/* Responses labels */
/* label {} */

/* Buttons (start, navigate and submit) */
/* .btn-primary {
  color: #FFFFFF;
  background-color: #00A09D;
  border-color: #00A09D;
}
.btn-primary:hover {
  color: #FFFFFF;
  background-color: #007a77;
  border-color: #006d6b;
} */""")

    scss_style = fields.Text(string="SCSS style", default=_get_default_style)
    start_btn_label = fields.Char(string="Start button label", translate=True, track_visibility='onchange',
        help="This label will be used in the survey start button. If empty, the label will be \"Start survey\".")
    submit_btn_label = fields.Char(string="Submit button label", translate=True, track_visibility='onchange',
        help="This label will be used in the survey submit button. If empty, the label will be \"Submit survey\".")
    thank_you_title = fields.Char(string="Thank you page title", translate=True,
        help="This title will be used in the survey \"Thank you\" page. If empty, the label will be \"Thank you !\".")