我有这个图像(https://cdn.pixabay.com/photo/2015/08/25/03/51/toner-906142__480.jpg)作为背景图像和它下面的这个灯箱。我想把灯箱放在我的背景图像上面，这样可以通过盒子看到背景图像。我试着进入画面，而不是置身于画面之外，但到目前为止一切都不起作用。
我想把这个标题和这些文字放在白色的盒子里，用背景图像观察槽(不透明度可能是0.5(。
<h2 style="color: black" align="center">Food is essential part of our well-being</h2>
<p>Our expertise </p>
这是引导程序/HTML。
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<link rel="stylesheet" href="style.css">
<title>Hello, world!</title>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="instagram" href="#">
<img src="https://cdn3.iconfinder.com/data/icons/picons-social/57/38-instagram-256.png" width="35" height="35" alt=""></a>
<a class="facebook" href="#">
<img src="https://cdn3.iconfinder.com/data/icons/wpzoom-developer-icon-set/500/01-256.png" width="35" height="35" alt=""></a>
<a class="twitter" href="#">
<img src="https://cdn2.iconfinder.com/data/icons/font-awesome/1792/twitter-square-256.png" width="35" height="35" alt=""></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#experts">Our experts <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item active">
<a class="nav-link" href="#service">Our service <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item active">
<a class="nav-link" href="#food">Food <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item active">
<a class="nav-link" href="#contact">Contact <span class="sr-only">(current)</span></a>
</li>
<!-- <li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li> -->
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>
<div class="container" href="service">
<img src="https://cdn.pixabay.com/photo/2015/08/25/03/51/toner-906142__480.jpg" id="ourservicepicture">
<div class="transbox">
<h2 style="color: black" align="center">Food is essential part of our well-being</h2>
<p>Our expertise </p>
</div>
</div>
</div>
</body>
</html>
和CSS：
h1{
}
#h1{
color:blue;
padding-bottom:30px;
font-family: CelebriSans;
}
h2{
font-family: CelebriSans;
margin-top:10px;
}
.navbar{
background-color:#c99ab1 !important;
height:11%;
}
.main{
height:60%;
width:100%;
grid-row: 1/4;
}
p{
font-family: CelebriSans;
font-size:16px;
font-style:bold;
}
div.container{
/* The image used */
/* background-image: url("https://cdn.pixabay.com/photo/2015/08/25/03/51/toner-906142__480.jpg"); */
position: relative;
max-width:100%;
/* Full height */
height: 100%;
margin: 0 auto; /* Center it */
/* Center and scale the image nicely */
background-position: center;
background-repeat: no-repeat;
background-size: cover;
}
/*
.container .content{
position: absolute;
/* background: rgb(0, 0, 0); /* Fallback color */
/*background: rgba(255,255,255, 0.5); /* White background with 0.5 opacity
color: black;
width: 75%;
padding: 20px;
}
*/
#ourservicepicture{
height:100%;
width:100%;
margin:0px;
margin-left:0px;
margin-right:0px;
}
div.transbox {
margin: 30px;
background-color: #ffffff;
border: 1px solid black;
opacity: 0.6;
filter: alpha(opacity=60); /* For IE8 and earlier */
}
div.transbox p {
margin: 5%;
font-weight: bold;
font-family: Verdana;
font-size: 12px;
color: #000000;
}
您可以在.container上使用display: flex来将.container中的元素放置在顶部。我添加了一些注释以最小化您的代码。看看吧！
.container {
background-image: url("https://cdn.pixabay.com/photo/2015/08/25/03/51/toner-906142__480.jpg");
/* Add the background image like this */
height: 500px;
/* Give the background image the correct height */
background-repeat: no-repeat;
background-position: center;
background-size: cover;
display: flex;
/* Places content inside on top */
justify-content: center;
/* Center horizontally */
align-items: center;
/* Center vertically */
}
.transbox {
padding: 30px;
background-color: rgba(255, 255, 255, 0.5);
/* Opacity can be given to background with rgba*/
border: 1px solid black;
height: 100px;
}<div class="container" href="service">
<div class="transbox">
<h2>
Food is essential part of our well-being
</h2>
<p>Our expertise </p>
</div>
</div>只需将此CSS添加到您的.transbox样式中
https://jsfiddle.net/rjaw5nvx/
position: absolute;
top: 50%;
transform: translateY(-50%);
您也可以使用flexbox垂直和水平居中，但这有点复杂。