html {
  box-sizing: border-box;
  background:#ffc600;
  font-family:'helvetica neue';
  font-size: 20px;
  font-weight: 200;
}
body {
  margin: 0;
}
*, *:before, *:after {
  box-sizing: inherit;
}

.panels {
  min-height:100vh;
  overflow: hidden;
  display: flex;
}

.panel {
  background:#fff;
  box-shadow:inset 0 0 0 5px rgba(255,255,255,0.1);
  color:white;
  text-align: center;
  align-items:center;/*vertical center with flex*/
  /* Safari transitionend event.propertyName === flex */
  /* Chrome + FF transitionend event.propertyName === flex-grow */
  transition:
    font-size 0.7s cubic-bezier(0.61,-0.19, 0.7,-0.11),
    flex 0.7s cubic-bezier(0.61,-0.19, 0.7,-0.11),
    background 0.2s;
  font-size: 20px;
  background-size:cover;
  background-position:center;
  flex:1;
  /* border: 1px solid green; */
  display: flex;
  flex-direction: column;/*vertial column instead of row*/
  justify-content: center;/*horizontal center with flex*/
  cursor: pointer;
}

a, p, img {
  cursor: pointer;
}

.panel1 { background-image:url(background_1.jpg); }
.panel2 { background-image:url(background_2.jpg); }
.panel3 { background-image:url(background_3.jpg); }
.panel4 { background-image:url(background_4.jpg); }
.panel5 { background-image:url(background_5.jpg); }

/*flex children*/
/*flex items*/
.panel > * {
  margin:0;
  width: 100%;
  transition:transform 0.5s;

  /* border: 1px solid orange; */
  flex: 1 0 auto;
  display: flex;
  justify-content: center;/*horizontal center with flex*/
  align-items: center; /*vertical center with flex*/
}


.panel > *:first-child {
  transform: translateY(-100%);
}
.panel.open.active > *:first-child{
  transform: translateY(0);
}
.panel > *:last-child{
  transform: translateY(100%);
}
.panel.open.active > *:last-child{
  transform: translateY(0);
}





.panel p {
  text-transform: uppercase;
  font-family: 'Amatic SC', cursive;
  text-shadow:0 0 4px rgba(0, 0, 0, 0.72), 0 0 14px rgba(0, 0, 0, 0.45);
  font-size: 2em;
}
.panel p:nth-child(2) {
  font-size: 4em;
}

.panel.open {
  font-size:40px;
  flex:5;
}

.black{
  color: #000;
  text-shadow: none;

}