The generated HTML div, input & select elements lack their Jenkins CSS classes. This results in the ugly look of the generated input fields (see attachment, parameter BRANCH_SELECTOR).

• Text fields should have class "jenkins-input"
• Single-select fields should have classes "jenkins-select__input" & "dropdownList"
• Single-select div-containers should have class "jenkins-select"
• Other types of inputs probably also miss appropriate CSS classes
• (Optional) Filter fields for single-select should be aligned in line, to the right of the select field.