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

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

/* flex items start */

.panel>* {
   margin: 0;
   width: 100%;
   transition: transform 0.5s;
   display: flex;
   flex: 1 0 auto;
   justify-content: center;
   align-items: center;
}

/* flex items end */

/* transform subtext on hover start */

.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);
}

/* transform subtext on hover end */

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

/* slider images start */

.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');
}

/* slider images end */