不透明度の遷移が機能しない、Z-インデックスの問題？

Question

デフォルトのプロパティをいくつかリセットする前に、すべて正常に動作していましたが、それぞれの不透明効果がもう機能していません。 Zインデックスの配置をどれだけプレイしても、うまくいかないようです。

同様に、私の "好きな"ボタンは、それぞれが同じ場所に繰り返し配置されていない場合、正しく配置されていません。

誰かが私にそれを見てもらえますか？ありがとうございました。

これはこれは、CSSここ

html 
{ 
    min-width: 100%; 
    min-height: 100%  
} 

body 
{ 
    margin:0; 
    padding:0; 
    max-width:100%; 
    overflow-y: scroll; 
    overflow-x: hidden; /*Disable horizontal scrollbar*/ 
} 

#background /*Background image*/ 
{ 
    position: fixed; 
    top: 0; 
    left: 0; 
    /* Preserve aspet ratio */ 
    min-width: 100%; 
    min-height: 100%; 
    z-index: -4; 
    opacity: .5; 
} 
* 
{ 
    font-family: 'Roboto', Tahoma, Arial; 
} 
header 
{ 
    background-color: #144762; /*VIU colours*/ 
    padding: 30px; 
    margin-left: 5px; 
    margin-right: 5px; 
    margin-top: -10px; 
} 
#logo 
{ 
    float: left; 
    top: 40px; 
    left: 40px; 
    position: absolute; 

} 
h1 
{ 
    margin-left: 500px; 
    color: #FFFFFF; 
} 

/*Navigation Menu, <nav>*/ 
#menu /*entire box*/ 
{ 
    list-style: none; 
    border: 1px solid #000; 
    background-color: #ecffec;/*#444 the Navigator nav color*/ 
    padding: 0; 
    position: absolute; 
    width: 100%; 
    left: 0; 
    margin: 0; 
} 
#menu li /*text box*/ 
{ 
    margin-right: 3px; 
    border: 1px solid #ecffec; 
    position: relative; 
    list-style: none; 
    float: left; 
    padding: 0; 
    line-height: 15px; 
    font-weight: bold; 
} 
#menu ul /*Actual dropdown menu*/ 
{ 
    position: absolute; 
    left: 0; 
    display: none; 
    list-style: none; 
    border: 1px solid #000; 
    background-color: #ecffec; 
    padding: 0; 
    margin: 0; 
    float: left; 
    line-height: 15px; 
    width: auto; 
} 
#menu ul li /*text inside dropdown menu*/ 
{ 
    float: none; 
    margin: 0; 
    padding: 0; 
    line-height: 15px; 
    min-width: 150px; 
} 
#menu a:link, 
#menu a:visited, 
#menu label { 
display: block; 
font-family: 'Roboto', Tahoma; 
font-size: 0.75em; 
font-weight: bold; 
text-align: left; 
text-decoration: none; 
color: #000; 
padding: 5px; 
} 

#menu li:hover, 
#menu input:checked + label { 
background-color: #ffd98a; 
border: 1px solid #000; 
} 

#menu li:hover ul, 
#menu input:checked ~ ul { 
display: block; 
} 

#menu input { 
display: none; 
}isited, #menu label { display: block; font-size: 15px; font-weight: bold; text-align: left; text-decoration: none; color: #000; padding: 5px; } 

/*Contact information*/ 
#emergencycontact /*entire box, <aside>*/ 
{ 
    list-style: none; 
    border: 1px solid #000; 
    background-color: #ecffec; 
    padding: 0; 
    position: fixed;/*added this*/ 
    width: 120px; 
    right: 0; 
    bottom: 0; 
    z-index: 5; 

} 
#emergencycontact li /*text box*/ 
{ 
    border: 1px solid #ecffec; 
    position: relative; 
    float: none; 
    margin: 0; 
    padding: 0; 
    line-height: 15px; 
    font-weight: bold; 
} 
#emergencycontact ul /*Actual popout window*/ 
{ 
    position: absolute; 
    bottom: 27px; 
    right:0; 
    width: 500px; 
    height: 300px; 
    display: none; 
    list-style: none; 
    border: 1px solid #000; 
    background-color: #ecffec; 
    padding: 0 0 26px 0; 
    margin: 0; 
    float: none; 
    line-height: 15px; 
    overflow: scroll; 
    font-weight: normal; 
} 
#emergencycontact a:link, #emergencycontact a:visited 
{ 
    display: block; 
    font-size: 15px; 
    font-weight: bold; 
    text-align: left; 
    text-decoration: none; 
    color: #000; 
    padding: 5px; 
} 
#emergencycontact li:hover, 
#emergencycontact input:checked + label 
{ 
    background-color: #ffd98a; 
    border: 1px solid #000; 
} 

#emergencycontact li:hover ul, 
#emergencycontact input:checked ~ ul 
{ 
    display: block; 
} 

#emergencycontact input 
{ 
    display: none; 
} 

#emergencycontact label 
{ 
    display: block; 
    padding: 5px; 
} 
p.underline 
{ 
    text-decoration: underline; 
    margin-left: 20px; 
} 
p.italic 
{ 
    font-style: italic; 
} 
.heading 
{ 
    text-align: center; 
} 
h4{ 
    text-decoration: underline; 
} 
p.contactheading{ 
    font-weight: bold; 
} 
h4, p.contactheading, p.italic, #emergencycontact p/*text inside dropdown menu*/ 
{ 
    float: none; 
    margin: 0; 
    padding: 15px; 
} 

/*Sectional blocks*/ 
section 
{ 
    margin: 40px 23px; 
    width: 100%; 
} 
div.sectionalblocks 
{ 
    float:left; 
    display:inline-block; 
    position:relative; 
    z-index: -4; 
    width: 400px; 
    height: 400px; 
} 
div.sectionalblocks img /*Image underneath sectional blocks*/ 
{ 
    width:400px; 
    height:400px; 
    display:block; 
    float:left; 
    position: relative; 



} 
#articleimage /*Image underneath article*/ 
{ 
    position: absolute; 
    z-index: -3; 
    filter: brightness(80%); 
    opacity: 0.8; 
} 
#articlepreview /*Text inside article sectional blocks*/ 
{ 
    position: relative; 
    float: left; 
    height: 400px; 
    width: 360px; 
    padding: 20px; 
    display: inline-block; 
    vertical-align: middle; 
    color: white; 
} 
#articlepreview h2 /*Header text inside article sectional blocks*/ 
{ 
    text-decoration: underline; 
    color: white; 
} 
span.text-content /*Text inside sectional blocks*/ 
{ 
    float:left; 
    position:absolute; 
    height:400px; 
    width:400px; 
    font-family:"proxima nova",sans-serif; 
    font-style: normal; 
    font-weight: 300; 
    font-size: 30px; 
    letter-spacing: 4px; 
    background: rgba(0,0,0,0.3); 
    color: white; 
    cursor: pointer; 
    display:table; 
    opacity:0; 
    z-index:5; 
    padding:0; 
    -webkit-transition: opacity 500ms; 
    -moz-transition: opacity 500ms; 
    -o-transition: opacity 500ms; 
    transition: opacity 500ms; 
} 
span.text-content span 
{ 
    display: table-cell; 
    text-align: center; 
    vertical-align: middle; 
} 
span.text-content:hover 
{ 
    opacity:1; 
} 
iframe.likebutton 
{ 
    position: absolute; 
    left: 10px; 
    bottom: 0; 
    z-index: 5; 
} 


/*Footer*/ 
#validator 
{ 
    position: relative; 
    bottom:0; 
    left: 20px; 
    width:100%; 

} 

がライブバージョンであるHTML

<!DOCTYPE html> 
<html lang="en"> 

<head> 
<link rel="stylesheet" type="text/css" href="CSS/index.css"> 
<link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet"> 
<title>Website Project</title> 
<meta charset="utf-8"/> 
</head> 
<body> 
<header> 
    <h1>Vancouver Island University</h1> 
    <h1>Health and Wellness Community</h1> 
    <h1>"No more excuses"</h1> 
    <a href="index.html"><img id="logo" src="Images/VIU-logo-small.jpg" alt="VIU logo" title="VIU logo"></a> 
</header> 
<img src="Images/websitebackground.jpg" id="background" alt="website background image"> 
<nav> 
    <ul id="menu"> 
     <li><a href="#">About</a></li> 
     <li> 
      <input type="checkbox" id="navigation"/> 
      <label for="navigation" name="navigation">Events and Workshops</label> 
      <ul> 
       <li><a href="#">Upcoming Events</a></li> 
       <li><a href="#">Upcoming Workshops</a></li> 
       <li><a href="#">Request an Event or Workshop</a></li> 
      </ul> 
     </li> 
     <li> 
      <input type="checkbox" id="navigation2"/> 
      <label for="navigation2" name="navigation2">Resources</label> 
      <ul> 
       <li><a href="#">Nutrition Resources</a></li> 
       <li><a href="#">Physical Activity Resources</a></li> 
       <li><a href="#">Mental Health Resources</a></li> 
       <li><a href="#">Spiritual Health Resources</a></li> 
       <li><a href="#">Social Health Resources</a></li> 
       <li><a href="#">Medical Health Resources</a></li> 
      </ul> 
     </li> 
     <li><a href="#">Contact Us</a></li> 
     <li><a href="#">Volunteer Opportunities</a></li> 
     <li><a href="#">Blog</a></li> 
    </ul> 
</nav> 
<section> 
    <div class="sectionalblocks"> 
     <a target="_self" href="#"> 
      <img src="Images/blog.png" alt="Blog Article"> 
      <span class="text-content"><span> Blog </span></span> 
     </a><iframe class="likebutton" src="https://www.facebook.com/plugins/like.php?href=https%3A%2F%2Fdevelopers.facebook.com%2Fdocs%2Fplugins%2F&width=153&layout=button_count&action=like&size=large&show_faces=true&share=true&height=46&appId" width="153" height="46" style="border:none;overflow:hidden" scrolling="no" frameborder="0" allowTransparency="true"></iframe> 
    </div> 
    <div class="sectionalblocks"> 
     <div id="articlepreview"><h2>Glorifying Exhaustion: The student crisis</h2><p>It’s that time of year again; between the midterms, papers, and looming final exams, people start to brag about how they are on their sixth extra-large triple-shot coffee, or that they pulled an all-nighter to get their paper in on time...</p></div> 
     <a target="_blank" href="http://www.thenav.ca/2016/11/16/glorifying-exhaustion-the-student-crisis/"> 
      <img id="articleimage" src="Images/articleimage.jpg" alt="Resource Article"> 
      <span class="text-content"><span>Resources</span></span> 

     </a><iframe id="likebutton" src="https://www.facebook.com/plugins/like.php?href=https%3A%2F%2Fdevelopers.facebook.com%2Fdocs%2Fplugins%2F&width=153&layout=button_count&action=like&size=large&show_faces=true&share=true&height=46&appId" width="153" height="46" style="border:none;overflow:hidden" scrolling="no" frameborder="0" allowTransparency="true"></iframe> 
    </div> 
    <div class="sectionalblocks"> 
     <a target="_self" href="#"> 
      <img src="Images/upcomingevents.png" alt="Upcoming Events Article"> 
      <span class="text-content"><span>Upcoming Events</span></span> 

     </a><iframe class="likebutton" src="https://www.facebook.com/plugins/like.php?href=https%3A%2F%2Fdevelopers.facebook.com%2Fdocs%2Fplugins%2F&width=153&layout=button_count&action=like&size=large&show_faces=true&share=true&height=46&appId" width="153" height="46" style="border:none;overflow:hidden" scrolling="no" frameborder="0" allowTransparency="true"></iframe> 
    </div> 
    <div class="sectionalblocks"> 
     <a target="_self" href="#"> 
      <img src="Images/volunteer.png" alt="Volunteer Article"> 
      <span class="text-content"><span>Volunteer</span></span> 

     </a><iframe class="likebutton" src="https://www.facebook.com/plugins/like.php?href=https%3A%2F%2Fdevelopers.facebook.com%2Fdocs%2Fplugins%2F&width=153&layout=button_count&action=like&size=large&show_faces=true&share=true&height=46&appId" width="153" height="46" style="border:none;overflow:hidden" scrolling="no" frameborder="0" allowTransparency="true"></iframe> 
    </div> 
    <div class="sectionalblocks"> 
     <a target="_self" href="http://blog.myfitnesspal.com/10-nutritious-smoothies-250-calories/"> 
      <img src="Images/smoothies.jpg" alt="Nutrition Article"> 
      <span class="text-content"><span>Nutrition</span></span> 

     </a><iframe class="likebutton" src="https://www.facebook.com/plugins/like.php?href=https%3A%2F%2Fdevelopers.facebook.com%2Fdocs%2Fplugins%2F&width=153&layout=button_count&action=like&size=large&show_faces=true&share=true&height=46&appId" width="153" height="46" style="border:none;overflow:hidden" scrolling="no" frameborder="0" allowTransparency="true"></iframe> 
     </div> 
    <div class="sectionalblocks"> 
     <div id="articlepreview"><h2>I Want To Be With Someone Who Knows What It’s Like To Be Broken</h2><p>When seeking a partner, most people have pretty generic things that they’re looking for. They want a man to be handsome, smart, successful, funny, kind. But most qualities that people rattle off don’t go much deeper than that. For me, there’s something rare and unconventional I’m looking for in another person. A quality that I know will mean I truly found the right partner...</p></div> 
     <a target="_blank" href="http://thoughtcatalog.com/kelly-bishop/2016/03/i-want-to-be-with-someone-who-knows-what-its-like-to-be-broken/"> 
      <img id="articleimage" src="Images/mentalhealth.jpg" alt="Mental Health Article"> 
      <span class="text-content"><span>Resources</span></span> 

     </a><iframe id="likebutton" src="https://www.facebook.com/plugins/like.php?href=https%3A%2F%2Fdevelopers.facebook.com%2Fdocs%2Fplugins%2F&width=153&layout=button_count&action=like&size=large&show_faces=true&share=true&height=46&appId" width="153" height="46" style="border:none;overflow:hidden" scrolling="no" frameborder="0" allowTransparency="true"></iframe> 
    </div> 
</section> 

<aside> 
    <ul id="emergencycontact"> 
     <li> 
      <input type="checkbox" id="contact"/> 
      <label for="contact" name="contact">Contact</label> 
      <ul> 
       <h3 class="heading">Emergency Contacts</h3> 
       <h4>Assistance Phones</h4> 
       <p class="underline"><a href="https://www2.viu.ca/facilities/docs/VIU-AssistancePhones-Map.pdf">Location Map Link</a></p> 
       <h4>Vancouver Island University Counselling Services</h4> 
       <p class="italic">Monday - Friday; 8 am - 4 pm</p> 
       <p>Nanaimo Campus Phone: 250-740-6416</p> 
       <p>Cowichan Campus Phone: 250-746-3509</p> 
       <p>Parksville Campus Phone: 250-248-2096</p> 
       <p>Powell River Campus Phone: (604) 485-2878</p> 
       <h4>Mental Health Walk-in Clinic (Crisis Counselling)</h4> 
       <p class="italic">Monday - Friday; 10am - 6pm</p> 
       <p>Nanaimo Phone: 250-739-5710</p> 
       <p>Location: 203-2000 Island Highway North, Nanaimo, BC V9S 5W3</p> 
       <p class="underline"><a href="http://www.viha.ca/mhas/locations/nanaimo/">Island Health Website</a></p> 
       <h4>Vancouver Island Crisis Line</h4> 
       <p class="italic">7 days a week/24 hours a day</p> 
       <p>Phone: 1-888-494-3888</p> 
       <p class="underline"><a href="http://www.vicrisis.ca/">Crisis Line Website</a></p> 
       <p class="contactheading">Haven Transition House Crisis Line Support for abused women and their children</p> 
       <p class="italic">7 days a week/24 hours a day</p> 
       <p>Phone: 250-756-0616</p> 
       <h4>On Campus Emergency</h4> 
       <p class="contactheading">Emergency, First Aid, Security, Ambulance, Fire, Police, Bomb Threat</p> 
       <p class="italic">7 days a week/24 hours a day</p> 
       <p>Office/Internal Phone Nanaino/Cowichan Phone: 6600</p> 
       <p>Office/Internal Phone Powell River Phone: 8121 or 911</p> 
       <p>Office/Internal Phone Parksville Phone: 951-3000 or 911</p> 
       <p class="contactheading">Emergency Phone Push button</p> 
       <p>Pay Phone Nanaimo Phone: 740-6600</p> 
       <p>Pay Phone Cowichan Phone: 1-250-740-6600</p> 
       <p>Pay Phone Powell River Phone: 604-485-2878</p> 
       <p>Pay Phone Parksville Phone: 951-3000 or 911</p> 
       <h4>Off Campus Emergency</h4> 
       <p class="contactheading">Police, Fire, and Ambulance Services</p> 
       <p class="italic">7 days a week/24 hours a day</p> 
       <p>Phone: 911</p> 
       <h4>Nanaimo Regional General Hospital</h4> 
       <p class="italic">7 days a week/24 hours a day</p> 
       <p>Phone: 250-754-2141</p> 
       <p>Location: 1200 Dufferin Crescent, Nanaimo, BC V9S 5R6</p> 
       <h4>Email contact</h4> 
       <p class="underline">behealthy@viu.ca</p> 
      </ul> 
     </li> 
    </ul> 
</aside> 
<footer id="validator"> 
    <a href="https://validator.w3.org/nu/?doc=http%3A%2F%2Fmediastudies.viu.ca%2FStudents%2F577081557%2FLabs%2Flab02.html"><img src="Images/html-validator.jpg" alt="HTML validator badge"></a> | <a href="https://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%2Fmediastudies.viu.ca%2FStudents%2F577081557%2FLabs%2Findex.html&profile=css3&usermedium=all&warning=1&vextwarning=&lang=en"><img src="Images/css-validator.gif" alt="CSS validator badge"></a> 
</footer> 
</body> 
</html> 

です：https://jsfiddle.net/nxb8bann/1/ 注：ホバー不透明度遷移効果が動作しているようですここでは、私のブラウザではない（クロム/ firefox）

Answer 1

フッターセクションがメインコンテンツと重なっています。フッターの位置が、あなたの好きなボタンのメインコンテンツの後ろにあることを確認する必要があります。

#validator { clear:both; } 

Answer 2

あなたが言うように、それはあなたのウェブページの矛盾する何かであるかもしれないので、フィドルでうまくいくようです。

「好きな」ボタンの位置は、絶対位置に変更する必要があります。このような。

div.sectionalblocks iframe { 
    position: absolute; 
    left: 15px; 
    bottom: 0px; 
} 

がここに改正フィドルを見て取る：それはまだ動作していないhttps://jsfiddle.net/4j5Lkvsc/