CSS叠加效果会干扰图像上的CSS文本

Question

I need to display a text on the image using CSS. I'm doing that using H2 tag:

<h2 class="post-message">Test</h2>

Here is the code for CSS:

 .post-message {
  position: absolute;
  bottom: 10px;
  left: 10px;
  background: rgba(0, 0, 0, 0.75);
  padding: 4px 8px;
  color: white;
  margin: 0;
  font: 14px Sans-Serif;
}

But the overlay effect is messing things up and here is the code:

.overlay{
    overflow: hidden;
    background: #000;
}

.overlay img{
 -webkit-transition: -webkit-transform .3s ease-out;
    -moz-transition: -moz-transform .3s ease-out;
    -o-transition: -o-transform .3s ease-out;
    transition: transform .3s ease-out;
}

.overlay:hover img{ 
    -webkit-transform: scale(1.2) rotate(-5deg);
    -moz-transform: scale(1.2) rotate(-5deg);
    -o-transform: scale(1.2) rotate(-5deg);
    -ms-transform: scale(1.2) rotate(-5deg);
    transform: scale(1.2) rotate(-5deg);
    opacity: 0.7;   
}

I don't know how to explain what happens and I uploaded 2 screens:

1. This screen shows the original image without Mouse hover: https://s22.postimg.org/xrsohlcw1/without_mouse_over.jpg On the first image you see a gray background that I don't know from where comes
2. The second image is the mouse over effect: that gray image is rotating according to overlay effect and is displayed at the right corner only :/ https://s22.postimg.org/a13x0ndmp/gra_color_disappears.jpg

A little red arrow will show you what happens on the second image. A help would be great! I tried all possible things that I knew, expert opinion always is the best solution. Thanks in advance!

<div class="post-thumbnail overlay">
    <a href="http://example.com/comey-wikileaks/">      
        <img src="http://example.com/wp-content/uploads/2017/04/comey-825x510.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image"  width="825" height="510">       
    </a>    
    <h2 class="post-message">Test</h2>
</div>

Answer 1

An img has a "replaced content" layout model and basically treated as an inline element, and that includes space at the bottom by default for the bottom part of characters, so there will be a small space between the bottom of an img and the bottom of the img 's container. To remove that gap at the bottom, either make the img display: block or use vertical-align: top .

If the image is rotating so far that you see the corner of it in the bottom/right corner, either increase your scale() or don't rotate as much until you can't see that anymore. I don't see it with the code you provided.

  .post-message { position: absolute; bottom: 10px; left: 10px; background: rgba(0, 0, 0, 0.75); padding: 4px 8px; color: white; margin: 0; font: 14px Sans-Serif; } .overlay { overflow: hidden; background: #000; } .overlay img { -webkit-transition: -webkit-transform .3s ease-out; -moz-transition: -moz-transform .3s ease-out; -o-transition: -o-transform .3s ease-out; transition: transform .3s ease-out; } .overlay:hover img { -webkit-transform: scale(1.2) rotate(-5deg); -moz-transform: scale(1.2) rotate(-5deg); -o-transform: scale(1.2) rotate(-5deg); -ms-transform: scale(1.2) rotate(-5deg); transform: scale(1.2) rotate(-5deg); opacity: 0.7; } img { vertical-align: top; } 

 <div class="post-thumbnail overlay"> <a href="http://example.com/comey-wikileaks/"> <img src="http://kenwheeler.github.io/slick/img/fonz1.png" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" width="825" height="510"> </a> <h2 class="post-message">Test</h2> </div> 

Answer 2

You could actually put your img together with your <h2> inside a <div> and let the whole <div> rotate....

Here is an example base on what you wrote:

(obvously, there's a few things to readjust, but it's more or less what you want, I guess ^^)

 .post-message { position: absolute; bottom: 10px; left: 10px; background: rgba(0, 0, 0, 0.75); padding: 4px 8px; color: white; margin: 0; font: 14px Sans-Serif; } .overlay{ overflow: hidden; background: #000; /*these two lines are new*/ display:inline-block; position:relative; } /*I apply style directly on the "overlay"*/ .overlay /*img*/{ -webkit-transition: -webkit-transform .3s ease-out; -moz-transition: -moz-transform .3s ease-out; -o-transition: -o-transform .3s ease-out; transition: transform .3s ease-out; } .overlay:hover /*img*/{ -webkit-transform: scale(1.2) rotate(-5deg); -moz-transform: scale(1.2) rotate(-5deg); -o-transform: scale(1.2) rotate(-5deg); -ms-transform: scale(1.2) rotate(-5deg); transform: scale(1.2) rotate(-5deg); opacity: 0.7; } 

 <span class="overlay"> <img src="https://www.codeproject.com/KB/GDI-plus/ImageProcessing2/img.jpg" /> <h2 class="post-message">Test</h2> </span>