*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #a0ffd0;
  --background-color: #1E1E2E;
}

body {
  font-family: 'Baloo 2', cursive;
  width: 100vw;
  min-height: 100vh;
  color: var(--primary-color);
  background-color: var(--background-color);
}

.navbar {
  margin: 0 auto;
  min-height: 20vh;
  max-width: 1080px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.title {
  font-size: 4rem;
  font-family: 'Baloo 2', cursive;
  font-weight: bold;
}

.container {
  margin: 0 auto;
}

.heading {
  font-size: 2rem;
}

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

.panel {
  flex-grow: 1;
  background: var(--background-color);
  box-shadow: inset 0 0 0 5px rgba(255,255,255,0.1);
  color: white;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  /* 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;
}

/* .panel1 { background-image:url(https://source.unsplash.com/gYl-UtwNg_I/1500x1500); } */
/* .panel2 { background-image:url(https://source.unsplash.com/rFKUFzjPYiQ/1500x1500); } */
/* .panel3 { background-image:url(https://images.unsplash.com/photo-1465188162913-8fb5709d6d57?ixlib=rb-0.3.5&q=80&fm=jpg&crop=faces&cs=tinysrgb&w=1500&h=1500&fit=crop&s=967e8a713a4e395260793fc8c802901d); } */
/* .panel4 { background-image:url(https://source.unsplash.com/ITjiVXcwVng/1500x1500); } */
/* .panel5 { background-image:url(https://source.unsplash.com/3MNzGlQM7qs/1500x1500); } */
.panel1 { background-image:url(https://images.unsplash.com/photo-1531297484001-80022131f5a1?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=820&q=80) }
.panel2 { background-image:url(https://images.unsplash.com/photo-1550745165-9bc0b252726f?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1470&q=80) }
.panel3 { background-image:url(https://images.unsplash.com/photo-1480506132288-68f7705954bd?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1520&q=80) }
.panel4 { background-image:url(https://images.unsplash.com/photo-1497493292307-31c376b6e479?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1471&q=80) }
.panel5 { background-image:url(https://images.unsplash.com/photo-1589070127509-ea788341cc5b?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1632&q=80) }

/* Flex Children */
.panel > * {
  margin: 0;
  width: 100%;
  transition: transform 0.5s;
}

.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 p:nth-child(1) {
  transition: transform 0.5s 0.5s;
  transform: translateY(-50vh);
}

.panel p:nth-child(3) {
  transition: transform 0.5s 0.5s;
  transform: translateY(50vh);
}

.panel.open {
  flex-grow: 4;
  font-size: 40px;
}