html - html(css)中图像拼贴上方的容器

Question

我在容器中创建了图像拼贴和小标志。现在我希望将容器放置在图像拼贴上。

html

<section id="signin">
  <div class="photos">
        <img src="http://www.hdwallpapersimages.com/winter-tiger-wild-cat-images/31073/">
        <img src="http://www.hdwallpapersimages.com/winter-tiger-wild-cat-images/31073/">
        <img src = "http://www.hdwallpapersimages.com/winter-tiger-wild-cat-images/31073/">
        <img src = "http://www.hdwallpapersimages.com/winter-tiger-wild-cat-images/31073/">
        <img src="http://www.hdwallpapersimages.com/winter-tiger-wild-cat-images/31073/">
        <img src="http://www.hdwallpapersimages.com/winter-tiger-wild-cat-images/31073/">
  </div>
  <div class="sign container-fluid">
    <div class ="container">
      <div class="row section_blurb">
        <h1> Sign In </h1>
         <div class="col-xs-12 col-sm-4">
            <a href = "http://www.facebook.com">
            <img  src="images/ic_facebook blue.svg" class = "img-responsive" align = "left"><p>Sign in with facebook</p></a>
            <a href = "https://plus.google.com">
            <img  src="images/ic_google plus red.svg" class = "img-responsive" align = "left"><p>Sign in with google+</p></a>
            <a href = "https://instagram.com/">
            <img  src="images/ic_instagram blue.svg" class = "img-responsive" align = "left"><p>Sign in with instagram</p></a>
            <a href = "#email">
           <img   src="images/ic_email white.svg" class = "img-responsive" align = "left"><p>Sign in with Email</p></a>
        </div>   
      </div>     
    </div>
  </div>  
</section>

CSS

.photos {
   /* Prevent vertical gaps */
   line-height: 0;

   -webkit-column-count: 4;
   -webkit-column-gap:   0px;
   -moz-column-count:    4;
   -moz-column-gap:      20px;
   -moz-row-gap:         20px; 
   column-count:         4;
   column-gap:           0px;
   z-index: auto;


}

.photos img {
  /* Just in case there are inline attributes */
  width: 100% !important;
  height: auto !important;
  padding-bottom: 20px;
}

容器css是标准的。在登录部分上下也有不同的部分

Answer 1

您必须将 position:relative 放在父级上:

#signin { position:relative; }

然后你可以使用绝对位置，并且元素将被放置在与父级相关的位置:

.photos { position:absolute; top:0; left:0; z-index:0; }
.sign { position:absolute; top:40px; right:40px; z-index:2; }

这里是文章解释:https://css-tricks.com/absolute-positioning-inside-relative-positioning/

Z-index 可能比较棘手，但请先尝试最简单的。 :)