.slider {
  width: 100%;
  height: 225px;
  position: relative;
  overflow: hidden;
}

.slider img {
  width: 100%;
  height: 222px;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.slider img:first-child {
  z-index: 1;
  opacity: 1;
}

.navigation-button {
  text-align: center;
  position: relative;
  margin-top: 10px;
}

.dot {
  cursor: pointer;
  height: 15px;
  width: 15px;
  margin: 0 2px;
  background-color: #bbb;
  border-radius: 50%;
  display: inline-block;
}

.active,
.dot:hover {
  background-color: #717171;
}