.centra93{width: 93%;margin: 0 auto;}
.contenedor-slider {
	     display: -webkit-box;   /* Safari */
  margin: auto;
  width: 100%;
  max-width: 900px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 0 1px #fff, 0 15px 15px;
  margin: 0 0 5% 0;
          height: 100%;
          max-height: 450px;
         -webkit-flex-direction: row;    
         -ms-flex-direction: row;    
         flex-direction: row;
         -webkit-box-pack: justify; /* Safari */
         -webkit-flex-pack: justify;
         justify-content: space-around;
         z-index : 1 ;}
.slider {      
          display: -webkit-box;   /* Safari */
          display: -webkit-flex;
          display: -moz-flex;
          display: -ms-flex;
          display: -o-flex;
          display: flex;
  width: 900%;}
.slider__section {
           display: inline-flex;
  width: 100%;
           max-width: 900px;
           max-height: 450px;}
.slider__img {
	      max-width: 900px;
          max-height: 450px;
  display: block;
  width: 100%;
  height: 100%;}
.btn-prev, .btn-next {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.5);
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  line-height: 40px;
  font-size: 30px;
  font-weight: bold;
  text-align: center;
  border-radius: 50%;
  font-family: monospace;
  cursor: pointer;}
.btn-prev:hover, .btn-next:hover {
  background: white;}
.btn-prev {
  left: 2px;}
.btn-next {
  right: 2px;}
@media all and (max-width : 750px) {
.btn-prev, .btn-next {
  width: 30px;
  height: 30px;
  line-height: 30px;
  font-size: 20px;}	
  }