.navbar-fixed {
    top: 0;
  position: fixed;
}

#mainNav {
	
	background-color: white;
	
}


  body {
      position: relative; 
  }
  #section1 {padding-top:50px;height:500px;color: #fff; background-color: #1E88E5;}
  #section2 {padding-top:50px;height:500px;color: #fff; background-color: #673ab7;}
  #section3 {padding-top:50px;height:500px;color: #fff; background-color: #ff9800;}
  #section4 {padding-top:50px;height:500px;color: #fff; background-color: #00bcd4;}