html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  text-align: center;
}

section {
  min-height: 100%;
}

a {
  text-decoration: none;
}

li  {
  list-style-type: none;
}

h1, h2, h3, a {
  font-family: 'Roboto', sans-serif;
  font-weight: 500;
  color: #494949;
  text-transform: uppercase;
}

h2 {
  color: #5d7177;
}

h3 {
  font-size: 40px;
  padding-top: 8%;
  margin-bottom: 5px;
}

h4, p {
  font-family: 'Roboto Slab', serif;
  color: #494949;
}

hr {
  width: 30px;
  height: 3px;
  background: #494949;
  border: 0;
  margin: 0 auto 40px auto;
}

#logo, li, img {
  transition: all 300ms;
  -webkit-transition: all 300ms;
  -moz-transition: all 300ms;
  -o-transition: all 300ms;
}

/* HEADER ********************************/

header {
  width: 100%;
  height: 65px;
  position: fixed;
  top: 0;
  left: 0;
  background: white;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  z-index: 1;
}

#logo {
  width: 140px;
  float: left;
  margin: 10px 0 0 50px;
}

#logo:hover {
  opacity: 0.5;
}

#logo img {
  width: 100%;
}

header nav {
  float: right;
  margin: 10px 50px 0 0;
}

header nav ul li {
  float: left;
  margin-right: 25px;
}

header nav ul li a {
  font-size: 16px;
}

header nav ul li:hover {
  padding-top: 5px;
}

/* HOME ********************************/

#home {
  background: url(img/landing.png);
  background-position: center center;
  background-size: cover;
  background-attachment: fixed;
}

#home h1 {
  margin: 240px auto 0 auto;
  font-size: 110px;
}

#home h2 {
  margin: 0 auto 0 auto;
  font-size: 50px;
}

#home img {
  width: 32px;
  height: auto;
  margin-top: 150px;
  opacity: 0.7;
}

#home img:hover {
  opacity: 1;
}

/* ABSTRACT ********************************/

#abstract{
  background-color: #f0f0f0;
}

#energie {
  width: 900px;
  margin: 0 auto 350px auto;
}

#energie ul {
  padding: 0;
}

#energie ul li {
  width: 33.3%;
  float: left;
}

#energie img {
  width: 240px;
  height: 240px;
  border-radius: 10px;
}

#energie img:hover {
  transform: scale(1.1);
  -webkit-transform: scale(1.1);
  -moz-transform: scale(1.1);
  -o-transform: scale(1.1);
  box-shadow: 0 5px 5px rgba(0, 0, 0, 0.3);
}

#abstract h4 {
  font-size: 25px;
}

#abstract p {
  width: 700px;
  margin: 0 auto 0 auto;
}

/* Sonne, Biogas, Wind ********************************/

#sonne img, #biogas img, #wind img {
  width: 240px;
}

#sonne img:hover, #biogas img:hover, #wind img:hover {
  transform: scale(1.1);
  -webkit-transform: scale(1.1);
  -moz-transform: scale(1.1);
  -o-transform: scale(1.1);
}

#sonne h4, #biogas h4, #wind h4 {
  font-size: 25px;
}

#sonne p, #biogas p, #wind p {
  width: 700px;
  margin: 0 auto 0 auto;
}

/* Footer ********************************/

footer {
  width: 100%;
  height: 70px;
  background-color: #3f3f3f;
}

footer p {
  font-size: 12px;
  color: #f0f0f0;
  padding-top: 30px;
}