<div id="app">
  <div class="button active"></div>
  <div class="button"></div>
  <div class="button"></div>
  <div class="button"></div>
</div>

body {
  height: 100%;
  margin: 0;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  background-color: #e91e63;
}

#app {
  position: absolute;
  top: 50%;
  right: 0;
  left: 0;
  width: 180px;
  height: 20px;
  margin: 0 auto;
  transform: translateY(-50%);
  overflow: hidden;
  z-index: 1;
}

.button {
  width: 20px;
  height: 20px;
  float: left;
  margin-right: 20px;
  background-color: #fff;
  border-radius: 20px;
  cursor: pointer;
  transition: 0.3s ease width;
}

.button:last-child {
  margin-right: 0;
}

.button.active {
  width: 60px;
  cursor: auto;
}

$(function () {
  var button = $(".button");

  function switchToNext() {
    var _this = $(this);

    if (_this.hasClass("active")) return false;
    else {
      $(".button.active").removeClass("active");
      _this.addClass("active");
    }
  }

  button.on("click", switchToNext);
});