Accessibility of e-tools (Quizlet)

I use Quizlet a lot in my classes to set up quizzes for the students in various subjects. I am now trying to discuss about the Accessibility issues of Quizlet:

• Quizlet is very interactive and the one set of questions can be used to generate different sets of activities.
• We can ask the students also to develop their own quizzes from a particular topic and send to other students.
• The quizlet activities can be easily embedded into the blogs and Moodle for students to access.
• The main problem I face with Quizlet is when we embed it on Moodle or Blog we cannot change the font or the size of the screen.
• we cannot change the contrast as some students may have problems reading clack letters on White back ground.