影響子div的CSS不透明度

Question

我在this的幫助下試了opacity。除了一件事外，它確實運作良好。我想要使​​用不透明度的div也有其他內容。所以，當我在那個父div中使用opacity時，子div也會受到影響！怎麼做才能實現只有父div而不是子div？任何幫助將不勝感激。謝謝。

HTML：

<div id="profile_rightbar"> 

      <div id="shortcuts"> 
       <div class="icon pink"> 
        <a href="#"> 
         <p>Pictures</p> 
         <p>210</p> 
        </a> 
       </div> 
       <div class="icon green"> 
        <a href="#"> 
         <p>Videos</p> 
         <p>210</p> 
        </a> 
       </div> 
       <div class="icon blue"> 
        <a href="#"> 
         <p>Forums</p> 
         <p>210</p> 
        </a> 
       </div> 
       <div class="icon orange"> 
        <a href="#"> 
         <p>Pages</p> 
         <p>210</p> 
        </a> 
       </div> 
       <div class="icon pink"> 
        <a href="#"> 
         <p>Followers</p> 
         <p>210</p> 
        </a> 
       </div> 
       <div class="icon green"> 
        <a href="#"> 
         <p>Following</p> 
         <p>210</p> 
        </a> 
       </div> 
      </div> 

      <div id="status"> 
       <p>Always do your best. What you plant now, you will harvest later.</p> 
      </div> 

      <div id="write"> 
       <textarea id="redactor" name="content"> 
     <h2>Hello and Welcome</h2> 
     <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p> 
     <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p> 
       </textarea> 
      </div> 

      <div id="activity"> 

       <div class="picture"> 
        <a href="#"> 
         <p>The world is so perfect. How can one not love this beautiful world.</p> 
         <img src="image/world.jpg"> 
        </a> 
       </div> 

       <div class="picture"> 
        <a href="#"> 
         <p>The world is so perfect. How can one not love this beautiful world.</p> 
         <img src="image/world.jpg"> 
        </a> 
       </div> 

       <div class="forum"> 
        <a href="#"> 
        </a> 
       </div> 

       <div class="video"> 
        <a href="#"> 
        </a> 
       </div> 

       <div class="page"> 
        <a href="#"> 
        </a> 
       </div> 

       <div class="following"> 
        <a href="#"> 
        </a> 
       </div> 

      </div> 


     </div> 
     <div class="clear_right"></div> 

CSS：

html, body { 
    width: 100%; 
    height: 100%; 
} 

#main_wrapper { 
    width:100%; 
    height: 100%; 
    background:url(../image/pantera.jpg) no-repeat center center fixed; 
    -webkit-background-size: cover; 
     -moz-background-size: cover; 
     -ms-background-size: cover; 
     -o-background-size: cover; 
      background-size: cover; 
} 

#profile_page { 
    width: 800px; 
    margin: 0 auto; 
    overflow: hidden; 
    border: 1px solid red; 
} 

#username h1 { 
    text-align: center; 
    color: white; 
} 

#profile_leftbar { 
    width: 210px; 
    float: left; 
} 

#profile_picture { 
    background-color: white; 
    border-radius: 10px; 
    border: 1px solid #dbdbdb; 
} 

#profile_picture img { 
    display: block; 
    margin: 0 auto; 
    border: none; 
    max-width:190px; 
    padding: 8px; 
} 

#about { 
    background: #f4f4f4; 
    border-radius: 5px; 
    margin-top: 8px; 
    border: 1px solid #dbdbdb; 
} 

#about p { 
    text-align: center; 
    color: #000000; 
    padding-top: 3px; 
    padding-bottom: 3px; 
} 

#about hr { 
    height:1px; 
    border:0px solid ; 
    border-top:1px solid #ccc; 
} 

#follow_message { 
    width: 210px; 
    margin: 5px auto; 
} 

#follow_message li { 
    list-style-type: none; 
    float: left; 
    margin-left: 3px; 

} 

#follow_message a { 
    display: block; 
    width: 101px; 
    text-align: center; 
    height: 30px; 
    color: white; 
    text-decoration: none; 
    line-height: 30px; 
    margin: 2px 0; 
    background: maroon; 
} 





#profile_rightbar { 
    float: right; 
    width: 590px; 
} 

#shortcuts { 
    overflow: hidden; 
    width: 588px; 
    margin: 0 auto; 
} 

#shortcuts div { 
    float: left; 
    margin: 4px; 
} 

.icon a { 
    text-decoration: none; 
    text-align: center; 
    display: block; 
    color: white; 
    border-radius: 5px; 
    width: 88px; 
    padding: 1px; 
} 

.icon a:hover { 
    text-decoration: underline; 
} 

.pink a { 
    background-color:#d63175; 
} 

.green a { 
    background-color:#51b73c; 
} 

.blue a { 
    background-color:#2f8ae0; 
} 

.orange a { 
    background-color:#f7a809; 
} 

#status { 
    background-color:white; 
    box-shadow:5px 5px 20px 1px black; 
    max-width:490px; 
    word-wrap:break-word; 
    padding:6px; 
    margin: 15px auto; 
    text-align:center; 
    font-size:30px; 
    line-height: 32px; 
} 

#write { 
    width: 575px; 
    margin: 0 auto; 
} 

#write textarea { 
    font-size:20px; 
    max-width:575px; 
    width: 575px; 
} 

#activity { 
    margin: 10px; 
    width: 575px; 
} 

#activity { 
    border: solid red; 
    opacity: 0.2; 
    filter: alpha(opacity=20);  /* IE8 and lower */ 
    zoom: 1; 

#activity div { 
    background: white; 
    margin: 0 auto; 
} 

#activity .picture a img { 
    display: block; 
    max-width: 540px; 
    margin: 0 auto; 
} 

.picture a { 
    color: black; 
    text-decoration: none; 
} 

.picture a p { 
    margin-top:15px; 
    margin-left:15px; 
} 

Answer 1

不使用不透明它會影響所有的子元素

使用 background-color : rgba(255,255,255,0.2);

它只模糊父元素。