html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video {
  margin: 0;
  padding: 0;
  border: 0;
  vertical-align: baseline;
}

/* HTML5 display-role reset for older browsers */

article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section { display: block; }

body { line-height: 1; }

ol, ul { list-style: none; }

blockquote, q { quotes: none; }

blockquote:before, blockquote:after, q:before, q:after {
  content: '';
  content: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

* { font-family: 'Open Sans', sans-serif; }

strong { font-weight: 800; }

em { font-style: italic; }

h1 {
  font-size: 36px;
  line-height: 42px;
  text-align: center;
  padding: 20px;
}

h2 {
  font-size: 30px;
  line-height: 36px;
}

p {
  margin-bottom: 16px;
  line-height: 22px;
}

p:last-of-type { margin-bottom: 0; }

code { font-family: 'Courier New'; }

section {
  -webkit-transition: all 0.4s ease;
  transition: all 0.4s ease;
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
}

section div {
  position: absolute;
  top: 80%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  opacity: 0;
  -webkit-transition: all 0.4s ease;
  transition: all 0.4s ease;
  padding: 30px;
  background-color: rgba(255, 255, 255, 0.8);
  width: 50%;
}

section div h2 { text-align: center; }

section:nth-of-type(1) { background-image: url(https://unsplash.it/1920/1080/?random); }

section:nth-of-type(2) { background-image: url(https://unsplash.it/1920/1280/?random); }

section:nth-of-type(3) { background-image: url(https://unsplash.it/1920/1480/?random); }

section:nth-of-type(4) { background-image: url(https://unsplash.it/1920/1680/?random); }

section:nth-of-type(4) h2 { margin-bottom: 20px; }

.active { background-color: orange !important; }

.active div {
  opacity: 1;
  top: 50%;
}

.after { opacity: 0; }

.after div {
  opacity: 0;
  top: -10%;
}

footer { background-color: white; }

footer p {
  text-align: center;
  margin: 0;
  padding: 20px;
}

footer p a {
  color: #13c0d7;
  text-decoration: none;
}

footer p a:hover { text-decoration: underline; }

/* Required Styles Start */

.fixed {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
}

.unfixed {
  position: relative;
  width: 100%;
}

/* Required Styles End */