.cont {
  /*max-height: 400px;*/
  background-color: black;
  margin: 0 auto;
  text-align: center;
  position: relative;
}
.cont div {
  background-color: white;
  width: 100%;
  display: inline-block;
  display: none;
}
.cont img {
  width: 100%;
  height: auto;
}

.btns {
  max-width: 200px;
  background-color: #E8EDFF;
  margin: 0 auto;
  text-align: center;
  position: relative;
  padding-bottom: 20px;
  padding-top: 10px;
}

button {
  position: absolute;
}

.nextbtn {
  right: 5px;
}

.prevbtn {
  left: 5px;
}