header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  padding-top: 25px;
}
body, html {
  background: black;
}
* {
  color: white;
  font-size: 15px;
  line-height: 1.25;
  font-family: Helvetica;
}
a {
  color: white;
}
a:hover {
  text-decoration: underline;
}
.InnerHeader {
  display: block;
  margin: auto;
  text-align: center;
}