.pslides {
  position: relative;
  list-style: none;
  overflow: hidden;
  width: 100%;
  padding: 0;
  margin: 0;
  }

.pslides li {
  -webkit-backface-visibility: hidden;
  position: absolute;
  display: none;
  width: 100%;
  left: 0;
  top: 0;
  }

.pslides li:first-child {
  position: relative;
  display: block;
  float: left;
  }

.pslides img {
  display: block;
  height: 507px;
  float: left;
  width: 100%;
  border: 0;
  }


.pslides_container {
  margin-bottom: 50px;
  margin-left: 132px;
  position: relative;
  float: left;
  width: 65%; 
  }
  

.centered-btns_nav {
  z-index: 3;
  position: absolute;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
  top: 50%;
  left: 0;
  text-indent: -9999px;
  overflow: hidden;
  text-decoration: none;
  height: 61px;
  width: 38px;
  background: transparent url("arrow.png") no-repeat left top;
  margin-top: -20px;
  cursor: pointer;
  }
  
.centered-btns_nav {
  opacity: 0; 
  }
  
.pslides_container:hover .centered-btns_nav { opacity: 1; visibility: visible;}

.centered-btns_nav.next {
  left: auto;
  background-position: right top;
  right: 0;
  }

.centered-btns_nav:focus {
  outline: none;
  }

.centered-btns_nav:active {
  opacity: 1;
  visibility: visible;
  }