var mainWrapper = document.getElementsByClassName("main pull-left")
      if (!mainWrapper.length) mainWrapper = document.getElementsByClassName("main")
      const mainHeader = mainWrapper[0].getElementsByClassName("clearfix")[0]
      const mainCustomFields = document.getElementsByClassName("custom-fields")[0]
      const [covidWrapper1,covidDropdown1] = createCovidDropdown("covid_dropdown1", "Have you been abroad during the last 7 days?")
      const [covidWrapper2,covidDropdown2] = createCovidDropdown("covid_dropdown2", "Have you contacted with any suspected/COVID-19 patients for the last 14 days?")
      const [covidWrapper3,covidDropdown3] = createCovidDropdown("covid_dropdown3", "Do you have any symptoms of cold (high temperature, etc.)?")
      const covidDropdownMessage = document.createElement("div")
      covidDropdownMessage.innerHTML = "Sorry, you are not allowed to visit the office."
      covidDropdownMessage.style.color = "red"
      covidDropdownMessage.hidden = true
      mainHeader.after(covidDropdownMessage)
      mainHeader.after(covidWrapper1)
      mainHeader.after(covidWrapper2)
      mainHeader.after(covidWrapper3)
      const covidDropdownList = [covidDropdown1,covidDropdown2,covidDropdown3]

      function createCovidDropdown(id, text){
        const wrapper = document.createElement("div")
        const covidDropdown = document.createElement("select")
        covidDropdown.id = id
        const optionNull = document.createElement("option")
        optionNull.innerHTML = "..."
        const optionYes = document.createElement("option")
        optionYes.innerHTML = "Yes"
        const optionNo = document.createElement("option")
        optionNo.innerHTML = "No"
        covidDropdown.appendChild(optionNull)
        covidDropdown.appendChild(optionYes)
        covidDropdown.appendChild(optionNo)
        covidDropdown.onchange = function(){ renderController() }
        const covidDropdownHeader = document.createElement("label")
        covidDropdownHeader.htmlFor = id
        covidDropdownHeader.innerHTML = text
        covidDropdownHeader.style.marginTop = "10px"
        covidDropdownHeader.style.marginRight = "50px"
        wrapper.appendChild(covidDropdownHeader)
        wrapper.appendChild(covidDropdown)
        return [wrapper,covidDropdown]
      }

// ==========================================

covidQuestions = true
        covidAllSelected = true
        covidDropdownList.forEach(covidDropdown => {
          if (covidDropdown.value !== "No") covidQuestions = false
          if (covidDropdown.value === "...") covidAllSelected = false
        })
        if (covidQuestions) {
          mainCustomFields.hidden = false
        } else {
          mainCustomFields.hidden = true
        }
        covidDropdownMessage.hidden = !(!covidQuestions && covidAllSelected)