.flex-direction-nav a {
  width: 40px;
  height: 44px;
}
.flex-direction-nav a:before {
  background-color: #31373a;
  display: block;
  color: white;
  text-align: center;
  line-height: 44px;
  font-size: 24px;
}

.flex-direction-nav .flex-prev {
  left: 0px;
}

.flex-direction-nav .flex-next {
  right: 0px;
}