Question

我希望你能帮助我解决以下问题/计划。

如何将我的元素置于Bootstrap中心，以便它们始终位于显示器的中心？在最好的情况下，元素位于显示器，智能手机和休息的中心

body {
    background: #222;
    font-family: 'Raleway', sans-serif;
}

.container {
    position: relative;
    top: 10%;
}


topo1 {
    color: #eee;
    font-weight: lighter;
}

h2 {
    color: #ddd;
    font-weight: lighter;
}

h4 {
    color: #bbb;
    font-weight: lighter;
}

.progress-bar-custom {
    font-family: "Helvetica";
}

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
    <title>Under Construction</title>

    <!-- Bootstrap -->
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <link href="style.css" rel="stylesheet">

    <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
    <!--[if lt IE 9]>
      <script src="https://oss.maxcdn.com/html5shiv/3.7.3/html5shiv.min.js"></script>
      <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
    <![endif]-->
  </head>
  <body>
    
	
	
	<div class="container">
	
		<div class="row">
			
			<div class="col-md-6 col-xs-12 col-sm-12">
			
				<h1 class="text-center">Name this is a h1</h1>
				
			</div>	
		</div>	
					
			
			
			
		<div class="row row-centered topo2">
			
			<div class=" col-centered col-md-6 block2">
				<h2 class="text-center">Subheading - this is h2</h2>
			
			</div>
		</div>
			
			
			
		<div class="row">	
			<div class="col-md-7 col-xs-12 col-sm-12">			
			
				<h4>Progess:</h4>
				<div class="progress">
					<div class="progress-bar progress-bar-striped progress-bar-success progress-bar-custom active" role="progressbar" aria-valuenow="55" aria-valuemin="0" aria-valuemax="100" style="width: 55%">
						55%
					</div>
				</div>
				
			</div>
		</div>
		
	</div>
	
    <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
    <!-- Include all compiled plugins (below), or include individual files as needed -->
    <script src="js/bootstrap.min.js"></script>
  </body>
</html>

Answer 1

你需要使用＆＃34; Flexbox＆＃34; 阅读this

Bootstrap 3 - 垂直居中

1 个答案: