How to make nav-fixed-top prevents content as a non-fixed navigation bar?


I want to make my navbar fixed on the top and push down content when I open the collapse menu like it normally do in static or just nav.

Like this: ( But I want the navbar to be fixed to top.

I read this before: Navbar-fixed-top pushes content on page up

but adding padding just won't work, please help me solve this xD

My code


/*------------------------------------------------- Hero Image -------------------------------------------------*/

        .calltoaction {
        text-align: center;
        -webkit-user-select: none; /* Chrome/Safari */
        -moz-user-select: none; /* Firefox */
        -ms-user-select: none; /* IE10+ */
        /* Rules below not implemented in browsers yet */
        -o-user-select: none;
        user-select: none;

        .calltoaction h1 {
        text-align: center;
        display: inline-block;
        font-size: 70px;
        /*text-transform: uppercase;*/
        letter-spacing: 2px;
        border: 8px solid #FFFFFF;
        border-radius: 13px;
        padding: 17px 20px;
        color: white;
        font-family: sans-serif;
        font-weight: 900;

        .calltoaction h3 {
        color: #FFFFFF;
        font-size: 29px;
        text-align: center;

        #hero-image {
        height: 870px;
        background: #e8eced url('') no-repeat center;

        #hero-image h1 {
        margin: 215px 0 7px 0;

        #hero-image h3 {
        margin: 3% 0 7px 0;

        /*#hero-image a {
        margin: 3% 0 7px 0;

/*------------------------------------------------- Hero Image -------------------------------------------------*/

/*------------------------------------------------- navbar----------------------------------------------*/
.navbar {
background-color: rgba(15, 91, 121, 0.03);
background: rgba(15, 91, 121, 0.03);
border-color: rgba(15, 91, 121, 0.03);
margin-bottom: 0px;

/*Line 4213-4217 in Bootstrap.css*/
/*Goal effect:*/


.navbar li {
color: #000;

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 1000;
  display: none;
  float: left;
  min-width: 160px;
  padding: 5px 0;
  margin: 2px 0 0;
  font-size: 14px;
  text-align: left;
  list-style: none;
  background-color: rgba(233, 237, 239, 0.42);
  -webkit-background-clip: padding-box;
          background-clip: padding-box;
  border: 1px solid #ccc;
  border: 1px solid rgba(15, 91, 121, 0.03);
  border-radius: 4px;
  -webkit-box-shadow: 0 6px 12px rgba(0, 0, 0, .175);
          box-shadow: 0 6px 12px rgba(0, 0, 0, .175);

/*Line 4513-4574 in Bootstrap.css define the colors of navbar texts and hover colors*/

<!DOCTYPE html>

    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <link href="css/index.css" rel="stylesheet">
    <script src="js/jquery-2.2.3.min.js"></script>
    <script src="js/bootstrap.min.js"></script>
    <link rel='shortcut icon' type='image/x-icon' href='favicons/0.ico' />



    <!-- Fixed Top Navbar, please add middle to top fixed navbar too when you can... -->

    <nav class="navbar navbar-default navbar-fixed-top">
      <div class="container">
        <div class="navbar-header">
          <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          <a class="navbar-brand" href="#">Nate's Testing Place</a>
        <div id="navbar" class="navbar-collapse collapse">
          <ul class="nav navbar-nav">
            <li><a href="#">Home</a></li>
            <li><a href="#about">About</a></li>
            <li><a href="#contact">Contact</a></li>
            <li class="dropdown">
              <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
              <ul class="dropdown-menu">
                <li><a href="#">Action</a></li>
                <li><a href="#">Another action</a></li>
                <li><a href="#">Something else here</a></li>
                <li role="separator" class="divider"></li>
                <li class="dropdown-header">Nav header</li>
                <li><a href="#">Separated link</a></li>
                <li><a href="#">One more separated link</a></li>
          <ul class="nav navbar-nav navbar-right">
            <!-- li class="active" -> transform button to grey -->
            <li><a href="#"><span class="glyphicon glyphicon-user"></span> Sign Up</a></li>
            <li><a href="#"><span class="glyphicon glyphicon-log-in"></span>&nbsp Log in</a></li>
        </div><!--/.nav-collapse -->

    <!-- Hero Image and texts -->
    <div id="hero-image">
        <div class="calltoaction">
            <h1><b>Nate's Testing Place</b></h1>
            <h3>Just a testing site, always open but not seven-eleven...</h3>
            <!--<a href="#" class="btn btn-lg btn-info" role="button">Let's Go</a>-->
    <!-- Hero Image and texts -->

        <div class="containter widgetpadding">
                <div class="col-md-4 col-xs-6">
                    <h4>My First Unity Game: Roller Madness (Project 2 of the coursera course)</h4>
                    <a href="Test.html" class="btn btn-info" role="button">Play Roller Madness</a>
                <div class="col-md-4 col-xs-6">
                    <h4>Just a nevbar testing page, css is so tricky......</h4>
                    <a href="NavTest.html" class="btn btn-info" role="button">Go to nevbar test page</a>
                <div class="col-md-4 col-xs-6">
                    <h4>Some installation info for installing Kali linux, no installation required now...</h4>
                    <a href="KaliLinux.html" class="btn btn-info" role="button">Kali Linux Installation info</a>
                <div class="col-md-4 col-xs-6">
                    <h4>Text Tutorial for dual-booting Arch and Windows10 UEFI......</h4>
                    <a href="Arch.html" class="btn btn-info" role="button">Arch info</a>
                <div class="col-md-4 col-xs-6">
                    <h4>Installing arch by installing Antergos is much more easier and pleasant......</h4>
                    <a href="Antergos.html" class="btn btn-info" role="button">Antergos info</a>
                <div class="col-md-4 col-xs-6">
                    <a href="ITX.html" class="btn btn-info" role="button">aetvretevtdsfv</a>

<!--Back to Top Widget:  -->
    <div class="">

<!--Back to Top Widget-->



navbar has a min-height of 50px as per this rule on line 4169 of bootstrap.css

.navbar {
  position: relative;
  min-height: 50px;
  margin-bottom: 20px;
  border: 1px solid transparent;

so for the div after navigation menu have a margin-top of at least 50px and it should work fine..