Как убрать слева и справа отступы ?
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<head>
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<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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<link rel="stylesheet" href="my.css">
<title>Hello, world!</title>
</head>
<body>
<div class="header-site">
<div class="container-fluid">
<div class="row">
<div class="col-sm-12 col-md-12 col-lg-12 text-center" >
<h1>Header</h1>
</div>
</div>
</div>
</div>
<div class="site-navigator-bar">
<div class="container-fluid">
<div class="row">
<div class="col-sm-12 col-md-12 col-lg-12">
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">Menu</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Randombutton</a>
</ul>
</div>
</nav>
</div>
</div>
</div>
</div>
<div class="contentt">
<div class="container-fluid">
<div class="row">
<div class="col-lg-2 col-md-2 col-sm-2 new">
<div class="list-group">
<a href="#" class="list-group-item list-group-item-action">
menu
</a>
<a href="#" class="list-group-item list-group-item-action">menu1</a>
<a href="#" class="list-group-item list-group-item-action">menu2</a>
<a href="#" class="list-group-item list-group-item-action">menu3</a>
<a href="#" class="list-group-item list-group-item-action">menu4</a>
</div>
</div>
<div class="col-lg-10 col-md-10 col-sm-10 new2">
</div>
</div>
</div>
</div>
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</body>
</html>
body{
font-family: Arial, Helvetica, sans-serif;
background-color: whitesmoke ;
font-size: 14px;
margin: 0 auto;
padding: 0;
color:#333;
}
.header-site{
background-color: lightseagreen;
height:150px;
min-width: 320px;
max-width: 1680px;
margin: 0 auto;
box-shadow: 0 2px 5px black;
}
.site-navigator-bar{
background-color: azure;
min-width: 320px;
max-width: 1680px;
margin: 0 auto;
box-shadow: 0 2px 5px black;
}
.contentt{
background-color:grey;
margin-bottom: 100px;
height:500px;
margin: 0 auto;
min-width: 320px;
max-width: 1680px;
margin-top: 4px;
box-shadow: 0 2px 5px black;
}
.new{
background-color: azure;
height: 500px;
}
.new2{
background-color: grey;
height: 500px;
}
.list-group{
width:500px;
margin-right:1 00px;
}