@import url(http://fonts.lug.ustc.edu.cn/css?family=Open+Sans);

html {
  height:100%;
  background-image: linear-gradient(to right top, #8e44ad 0%, #3498db 100%);
}

nav {
  max-width: 960px;
  mask-image: linear-gradient(90deg, rgba(255, 255, 255, 0) 0%, #ffffff 25%, #ffffff 75%, rgba(255, 255, 255, 0) 100%);
  margin: 0 auto;
  padding: 60px 0;
}

nav ul {
  text-align: center;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.2) 25%, rgba(255, 255, 255, 0.2) 75%, rgba(255, 255, 255, 0) 100%);
  box-shadow: 0 0 25px rgba(0, 0, 0, 0.1), inset 0 0 1px rgba(255, 255, 255, 0.6);
}

nav ul li {
  display: inline-block;
}

nav ul li a {
  padding: 18px;
  font-family: "Open Sans";
  text-transform:uppercase;
  color: rgba(0, 35, 122, 0.5);
  font-size: 18px;
  text-decoration: none;
  display: block;
}

nav ul li a:hover {
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1), inset 0 0 1px rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.1);
  color: rgba(0, 35, 122, 0.7);
}