懸停時圖像覆蓋？

Question

我試圖在圖像懸停上創建經典的「黑色」覆蓋圖。由於某種原因，我的是白色的。任何人都可以向我解釋我做錯了什麼？這是我的jsFiddle。

<img class="thumb-img"> 

.thumb-img:hover { 
    opacity:0.5; 
    -ms-transition: all 1s; 
    -o-transition: all 1s; 
    -webkit-transition: all 1s; 
    transition: all 1s; 
    background-color: #202020; 
} 

Answer 1

您的background-color屬性從來沒有見過，因爲圖像本身佔據了元素的整個空間。它包裝在一個<div>（或類似）：

.img-fade { 
 
    background-color: #202020; 
 
    float:left; 
 
} 
 
.img-fade img { 
 
    display: block; 
 
    
 
    -webkit-transition: opacity 1s linear; 
 
     -moz-transition: opacity 1s linear; 
 
     -ms-transition: opacity 1s linear; 
 
      -o-transition: opacity 1s linear; 
 
      transition: opacity 1s linear; 
 
} 
 

 
.img-fade img:hover { 
 
    opacity:0.5; 
 
}

<div class="img-fade"> 
 
    <img src="http://placehold.it/200x200" /> 
 
</div>