body, html {
  margin: 0;
  padding: 0;
}

.section {
  min-height: 800px;
  position: relative;
  text-align: center;
  font-family: sans-serif, arial;
  margin: 0;
}

h1, p {
  margin: 0;
  font-family: sans-serif, arial;
  font-weight: bold;
}

.text-wr {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
  -o-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

#section1 {
  background: #5c53aa;
  color: #8d86c3;
}

#section2 {
  background: #4bbfc3;
  color: #81d2d5;
}

#section3 {
  background: #283044;
  color: #686e7c;
}

#section4 {
  background: #ebf5ee;
  color: #aeb9b9;
}

h1 {
  font-size: 50px;
  margin-bottom: 25px;
}

.title-top {
  font-size: 60px;
  padding-bottom: 30px;
}

.title-bottom { font-size: 30px; }

.title-tx {
  font-size: 20px;
  opacity: 0.8;
}

.nav {
  position: fixed; /*left: 50%;*/
  width: 100%;
  top: 20px;
  z-index: 9;
  padding-left: 10px;
}

.nav a {
  padding: 7px 20px;
  border-radius: 7px;
  margin-right: 10px;
  background: rgba(255, 255, 255, 0.5);
  -webkit-transition: all 0.2s ease-out;
  -moz-transition: all 0.2s ease-out;
  -ms-transition: all 0.2s ease-out;
  -o-transition: all 0.2s ease-out;
  transition: all 0.2s ease-out;
  text-decoration: none;
  color: black;
  font-family: sans-serif, arial;
  font-weight: 100;
}

.nav a.active {
  background: rgba(0, 0, 0, 0.5);
  color: white;
}

.nav a:hover { background: rgba(255, 255, 255, 0.7); }