.o-btn-nv-rdv
{
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  font-size: 2.5rem;
  background: #0bd40b;
  width: 3rem;
  height: 3rem;
  text-align: center;
  border-radius: 1.5rem;
  color: white;
  z-index: 1;
  line-height: 3rem;
}