.nav-button{
  height: 30px;
  width: 30px;
  border-radius: 50%;
  border: 0;
  background: #7d5dee;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mobile-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 5;
  height: 34px;
  width: 34px;
  border-radius: 50%;
  border: 0;
  background: #7d5dee;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 10px rgba(0,0,0,.25);
}

.mobile-nav-btn.left {
  left: 6px;
}

.mobile-nav-btn.right {
  right: 6px;
}

@media (min-width: 768px) {
  .mobile-nav-btn {
    display: none;
  }
}