Accessibility: Contrast ratio not appropriate

[sjaeger24]

There is sometimes low contrast between text and background colours (errors detected by the WAVE tool):

• grey text colour on white background (for example "Manage questions": "position 1")
• red text colour on white background (for example "Manage questions", "Preview": "Parent Question: ..."
• checkboxes, radiobuttons (for example "View all responses" > "Individual responses")
• grey colour on white background for checkboxes, answers (for example "View your responses" > "Individual responses")