increased maximum speed

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
buttons must move when container moves

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
fixed a bug when pressing 'increase' button

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>