#header
  {
  background-color: #192444;
  height: 10%;
  position: fixed; -webkit-backface-visibility: hidden;
  width: 100%;
  left: 0; 
  top: 0;
  padding-top: 5%;
  box-sizing:border-box;
  z-index: +1;     
  }

#content
  {margin-top: 25%;}