.header {
    position: fixed;
    top: 0;
      z-index: 1000;
      height: 70px;
    width: 100%; 
      background: transparent;
      padding: 10px;
      -webkit-transition: all ease-out .5s;
    -moz-transition: all ease-out .5s;
    -o-transition: all ease-out .5s;
    transition: all ease-out .5s;
    margin-bottom: 50px;
  }
  
  .active {
    background-color:#475781;
  }