html - 在图像上添加不透明度

Question

我要开门见山了。我想在图像中创建一个简单的窗口。窗外会有像示例图片一样的不透明度。

我不太擅长 css，所以请多多包涵。

.section2{
 }

.section2 .row{
 margin: 0;
}
.the-container{
 position: relative;
 width: 100%;
 height: 450px;
}
.the-container .text-center{
 background: #fff;
 opacity: .9;
}

.img-canvas{
position: absolute;
top: 0px;
left: 0px;
right: 0px;
bottom: 0px;
width: 100%;
height: 100%;
background-image: url(https://www.aman.com/sites/default/files/styles/1371x706/public/amanpulo-location-1200-x-825.jpg?itok=4BQy9j-X);
background-size: 100% 100%;
background-position: 50% 50%;
background-attachment: scroll;
z-index: -1;
}
.window{
position:absolute;
width:50%;
height:50%;
background-size: cover;
top:0;
left:25%;
z-index: -1;
opacity: 1;
}

<section class="section2" style="height:100vh;">
<div class="row">
    <div class="col-md-10 col-md-offset-1">
        <div class="the-container">
            <div class="img-canvas"></div>
            <div class="window"></div>
        </div>
    </div>
</div>
</section>

是这样的:

这里有一个 fiddle 供您操作代码: https://jsfiddle.net/Lk21vL01/

提前致谢。

Answer 1

你已经非常接近了，你只需要对你的 .window 元素应用类似的样式并使用 background-attachment:fixed

看这个updated jsfiddle

.section2{
}

.section2 .row{
  margin: 0;
}
.the-container{
  position: relative;
  width: 100%;
  height: 450px;
}
.the-container .text-center{
    background: #fff;
    opacity: .9;
}
.window,
.img-canvas{
    position: absolute;
    top: 0px;
    left: 0px;
    right: 0px;
    bottom: 0px;
    width: 100%;
    height: 100%;
    background-image: url(https://www.aman.com/sites/default/files/styles/1371x706/public/amanpulo-location-1200-x-825.jpg?itok=4BQy9j-X);
    background-size: 100% 100%;
    background-position: 50% 50%;
    background-attachment:fixed;
    z-index: -1;
    opacity: 0.5;
}
.window{
  position:absolute;
  width:50%;
  height:50%;
  top:0;
  left:25%;
  z-index: -1;
  opacity: 1;
}