html, body {
  background: whitesmoke;
  margin: 0;
  padding: 0;
  width: 100%;
}

.slider {
  margin: 50px auto 0 auto;
  max-width: 350px;
}

.slide_viewer {
  height: 500px;
  overflow: hidden;
  position: relative;
}

.slide_group {
  height: 100%;
  position: relative;
  width:100%;
  text-align: center;
}

.slide {
  display: none;
  height: auto;
  position: absolute;
  width: 100%;
}
.slide img{width: 100%;}

.slide:first-child {
  display: block;
}

.slide_buttons {
  left: 0;
  position: absolute;
  right: 0;
  text-align: center;
}

a.slide_btn {
  color: #474544;
  font-size: 42px;
  margin: 0 0.175em;
  -webkit-transition: all 0.2s ease-in-out;
  -moz-transition: all 0.2s ease-in-out;
  -ms-transition: all 0.2s ease-in-out;
  -o-transition: all 0.2s ease-in-out;
  transition: all 0.2s ease-in-out;
}

.slide_btn.active, .slide_btn:hover {
  color: #428CC6;
  cursor: pointer;
}