* {
  box-sizing: border-box;
  -webkit-box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html, body {
  width: 100%;
  height: 100%;
  background-color: #3a7eb1;
  position: relative;
}
#intro {
  position: absolute;
  top: 15%;
  left: 50%;
  transform: translate(-50%, -50%);
  transfrom-origin: 50% 50%;
  -webkit-transform: translate(-50%, -50%);
  -webkit-transform-origin: 50% 50%;
}
h1, h2 {
  font-family: verdana, sans-serif;
  color: #fff;
  text-align: center;
}
h2 {
  font-weight: 400;
}
ul {
  min-width: 40px;
  height: 40px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  transfrom-origin: 50% 50%;
  -webkit-transform: translate(-50%, -50%);
  -webkit-transform-origin: 50% 50%;
  list-style-type: none;
  background-color: #fff;
  border-radius: 20px;
}
ul li {
  width: 40px;
  height: 40px;
  margin: 0 5px;
  float: left;
  line-height: 40px;
  color: #74b6e8;
  overflow: hidden;
  cursor: pointer;
  position: 
}
ul li:hover {
  color: #3a7eb1;
}
ul li i {
  font-size: 25px;
  vertical-align: middle;
  margin: 0 5px;
}
ul li:last-of-type {
  width: 40px;
  height: 40px;
  margin: 0px;
}
ul li:last-of-type i {
  font-size: 30px;
}
ul li:last-of-type:hover i {
  color: #3a7eb1;
}
ul li a {
  text-decoration: none;
  color: #74b6e8;
}
ul li a:hover {
  color: #3a7eb1;
}
ul li a:visited {
  text-decoration: underline;
}