popup.css

.container {
  width: 484px;
  height: 300px;
}

#dream,
#garden,
#main,
#disco {
  display: none;
}

#disco.active,
#main.active,
#dream.active,
#garden.active {
  display: block;
}

.button { 
  width: 24%;
  height: 20px;
  line-height: 20px;
  text-align: center;
  border-radius: 5px;
  cursor: pointer;
  display: inline-block;
  color: white;
  outline: 0;
  box-sizing: border-box;
  background: #fff;
}

#disco,
#dream,
#main,
#garden {
  margin: 10px 0;
  padding: 0;
}

.garden {
  border: 1px solid #0E892F;
  color: #0E892F;
}

.disco {
  border: 1px solid #ffa21a;
  color: #ffa21a;
}

.dream {
  border: 1px solid #72b5d0;
  color: #72b5d0;
}

.main {
  border: 1px solid #ff0000;
  color: #ff0000;
}

.garden.buttonActive {
  background: #0E892F;
  color: #fff;
}

.disco.buttonActive {
  background: #ffa21a;
  color: #fff;
}

.dream.buttonActive {
  background: #72b5d0; 
  color: #fff;
}

.main.buttonActive {
  background: #ff0000;
  color: #fff; 
}

#navContainer,
#trackContainer {
  width: 100%;
}

li {
  font: 200 14px/1.5 Helvetica, Verdana, sans-serif;
  border-bottom: 1px solid #ccc;
}

li:last-child {
  border-bottom: none;
}

li a {
  text-decoration: none;
  color: #000;
  -webkit-transition: font-size 0.3s ease, background-color 0.3s ease;
  -moz-transition: font-size 0.3s ease, background-color 0.3s ease;
  -o-transition: font-size 0.3s ease, background-color 0.3s ease;
  -ms-transition: font-size 0.3s ease, background-color 0.3s ease;
  transition: font-size 0.3s ease, background-color 0.3s ease;
  display: block;
}

li a:hover {
  font-size: 15px;
  background: #f6f6f6;
}

.dateContainerDiv {
  cursor: pointer;
}

.dateContainer {
  list-style-type: none;
  padding: 0;
  height: 0px;
  overflow: hidden;
  transition: height 0.5s ease;
}

.dateContainer.open {
  height: 100% !important;
  overflow: scroll !important;
}