Why does my img hover not work?

Question

I am trying to get to be set to an opacity: .04;, and when hovered over to be opacity:1; however, my img hover is not functioning. I am unsure of why t

Answer 1

Adjust your approach in your CSS. You are setting the opacity using the .intro-img class, so you will need to use the same class.

img.intro-img:hover {
    opacity: 1;
}

Answer 2

There are two possibilities in your code that if you want to make opacity 1 of background image by only hover mouse on that background there here is your code:

.container2 {
  margin: 0px;
  padding: 0px;
}
.intro {
width: 100%;
position: relative;
overflow: hidden;
  margin: 0;
  padding-top: 0;
}
#pic1 {
    position: absolute;
    top: 0;
    width: 100%;
    height: 100%;
}
.intro-img {
      display: block;
    margin: 0 auto;
    min-width: 100%;
  opacity: 0.4;
}
#pic1 img:hover{
  opacity: 1;
}
.wrapper {
  height: 200px;
    min-height: 200px;
    position: relative;
  padding-bottom: 0;
    margin-left: 3em;
    width: 330px;
}
.blue {
   background: #22428e;
    color: #fff;
}
.green{
     background: #de0e00;
    color: #fff;
}
#colors-content {
    height: 200px;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    width: 330px;
    padding: 0 25px;
}
h1 {
      text-transform: uppercase;
    font: 700 32px/35px 'Gotham SSm A','Gotham SSm B',Arial,Helvetica,sans-serif;
    margin: 0 0 34px;
  padding-top: 28px;
}
p {
  margin-top: -10px;
}
a {
  text-decoration: none;
  color: white;
}
a:hover {
  color: black;
}
@media screen and (max-width: 454px) { 
  .wrapper {
    min-height: 100px;
    position: relative;
}
#colors-content {
  height: 200px;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    width: 100%;
    padding: 0 25px;
margin-left: -4px;
}
  #pic1 {
    display: none;
}
}

<div class="container2">
<div class="intro">
  <div id="pic1">
     <img class="intro-img" src="https://s23.postimg.org/94clk2prf/resources_gender_spectrum2.png">
    </div> <!-- End pic1 -->
<div class="wrapper">
<article class="blue" id="colors-content">
  <div>
    <a href=""> <h1> Gender
      Spectrum.com </h1> </a>
    <p> I'm gone so i'me gone so long hah haha aha im bout it fuck it aiash  hth as jasd ashd as ahsdjas r ajsgda  uaju ashd ujawh uu ajshdhuiae</p>
  </div>
</article><!-- End of article -->
</div><!-- End wrapper -->
  </div> <!-- End intro -->
  </div> <! -- End of container2 -->

if you want to make background opacity to 1 once you hover your mouse on the front blue wrapper plus hover the mouse on background then here is the code:

.container2 {
  margin: 0px;
  padding: 0px;
}
.wrapper:hover + div#pic1 img.intro-img {
    opacity: 1;
}
.intro {
width: 100%;
position: relative;
overflow: hidden;
  margin: 0;
  padding-top: 0;
}
#pic1 {
    position: absolute;
    top: 0;
    width: 100%;
    height: 100%;
}
.intro-img {
      display: block;
    margin: 0 auto;
    min-width: 100%;
  opacity: 0.4;
}
#pic1 img:hover{
  opacity: 1;
}
.wrapper {
  height: 200px;
    min-height: 200px;
    position: relative;
  padding-bottom: 0;
    margin-left: 3em;
    width: 330px;
    z-index: 9;
}
.blue {
   background: #22428e;
    color: #fff;
}
.green{
     background: #de0e00;
    color: #fff;
}
#colors-content {
    height: 200px;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    width: 330px;
    padding: 0 25px;
}
h1 {
      text-transform: uppercase;
    font: 700 32px/35px 'Gotham SSm A','Gotham SSm B',Arial,Helvetica,sans-serif;
    margin: 0 0 34px;
  padding-top: 28px;
}
p {
  margin-top: -10px;
}
a {
  text-decoration: none;
  color: white;
}
a:hover {
  color: black;
}
@media screen and (max-width: 454px) { 
  .wrapper {
    min-height: 100px;
    position: relative;
}
#colors-content {
  height: 200px;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    width: 100%;
    padding: 0 25px;
margin-left: -4px;
}
  #pic1 {
    display: none;
}
}

<div class="container2">
<div class="intro">
<div class="wrapper">
<article class="blue" id="colors-content">
  <div>
    <a href=""> <h1> Gender
      Spectrum.com </h1> </a>
    <p> I'm gone so i'me gone so long hah haha aha im bout it fuck it aiash  hth as jasd ashd as ahsdjas r ajsgda  uaju ashd ujawh uu ajshdhuiae</p>
  </div>
</article><!-- End of article -->
</div><!-- End wrapper -->
  <div id="pic1">
     <img class="intro-img" src="https://s23.postimg.org/94clk2prf/resources_gender_spectrum2.png">
    </div> <!-- End pic1 -->

  </div> <!-- End intro -->
  </div> <! -- End of container2 -->