div.jumbotron.carousel-hero {
  color: #fff;
  text-align: center;
  background-size: cover;
  background-position: center;
  padding-top: 100px;
  padding-bottom: 100px;
  margin-bottom: 0;
}

div.jumbotron.hero-nature {
  background-image: url('hero-background-nature.jpg');
}

div.jumbotron.hero-photography {
  background-image: url('hero-background-photography.jpg');
}

div.jumbotron.hero-technology {
  background-image: url('hero-background-technology.jpg');
}

h1.hero-title, h2.hero-title, h3.hero-title {
  text-shadow: 0 3px 3px rgba(0,0,0,0.4);
  color: #fff;
}

p.hero-subtitle {
  max-width: 600px;
  margin: 25px auto;
  padding: 10px 15px;
  color: #fff;
}

body {
  background: -webkit-radial-gradient(center, circle, rgba(255,255,255,.35), rgba(255,255,255,0) 20%, rgba(255,255,255,0) 21%), -webkit-radial-gradient(center, circle, rgba(0,0,0,.2), rgba(0,0,0,0) 20%, rgba(0,0,0,0) 21%), -webkit-radial-gradient(center, circle farthest-corner, #f0f0f0, #c0c0c0);
  background: -moz-radial-gradient(center, circle, rgba(255,255,255,.35), rgba(255,255,255,0) 20%, rgba(255,255,255,0) 21%), -webkit-radial-gradient(center, circle, rgba(0,0,0,.2), rgba(0,0,0,0) 20%, rgba(0,0,0,0) 21%), -webkit-radial-gradient(center, circle farthest-corner, #f0f0f0, #c0c0c0);
  background: -ms-radial-gradient(center, circle, rgba(255,255,255,.35), rgba(255,255,255,0) 20%, rgba(255,255,255,0) 21%), -webkit-radial-gradient(center, circle, rgba(0,0,0,.2), rgba(0,0,0,0) 20%, rgba(0,0,0,0) 21%), -webkit-radial-gradient(center, circle farthest-corner, #f0f0f0, #c0c0c0);
  background: -o-radial-gradient(center, circle, rgba(255,255,255,.35), rgba(255,255,255,0) 20%, rgba(255,255,255,0) 21%), -webkit-radial-gradient(center, circle, rgba(0,0,0,.2), rgba(0,0,0,0) 20%, rgba(0,0,0,0) 21%), -webkit-radial-gradient(center, circle farthest-corner, #f0f0f0, #c0c0c0);
  background: radial-gradient(center, circle, rgba(255,255,255,.35), rgba(255,255,255,0) 20%, rgba(255,255,255,0) 21%), -webkit-radial-gradient(center, circle, rgba(0,0,0,.2), rgba(0,0,0,0) 20%, rgba(0,0,0,0) 21%), -webkit-radial-gradient(center, circle farthest-corner, #f0f0f0, #c0c0c0);
  background-size: 10px 10px, 10px 10px, 100% 100%;
  background-position: 1px 1px, 0px 0px, center center;
  top: 0;
}