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REF:
http://stackoverflow.com/questions/15587624/how-to-make-the-direction-nav-constant-on-flexslider

modify to make it look like this

.flex-direction-nav a {
  text-decoration: none;
  display: block;
  width: 40px;
  height: 40px;
  margin: -20px 0 0;
  position: absolute;
  top: 50%;
  z-index: 10;
  overflow: hidden;
  /* opacity: 0; */
  cursor: pointer;
  color: rgba(0, 0, 0, 0.8);
  text-shadow: 1px 1px 0 rgba(255, 255, 255, 0.3);
/*
  -webkit-transition: all 0.3s ease-in-out;
  -moz-transition: all 0.3s ease-in-out;
  -ms-transition: all 0.3s ease-in-out;
  -o-transition: all 0.3s ease-in-out;
  transition: all 0.3s ease-in-out;
  */
}