Fixing opacity of content inside div - html

Question

I have a div that has a background image but has 50% opacity.
Now I have a div that is child and I want what every the content it has to have 100% opacity. You can see in the snipplet headings and textbox and button has less opacity.
Can anyone help how to fix this thing? I tried to apply opacity 100% to child but it didn't work.
/* CSS to be fixed*/
#home_div
{
background-image: url("https://upload.wikimedia.org/wikipedia/commons/thumb/1/1e/Shoppers_on_Dundas%2C_near_Yonge.jpg/1200px-Shoppers_on_Dundas%2C_near_Yonge.jpg");
opacity: 0.5;
filter: alpha(opacity=50);
/*background-color: #0050A0;*/
background-color: lightgrey;
padding-top: 200px;
color: white;
padding-bottom: 200px;
height: 100%;
}
#home_div_content
{
opacity: 1.0;
filter: alpha(opacity=100);
text-align: center;
}
#header
{
height: 70px;
border-bottom: 4px solid lightgrey;
}
#header_content
{
margin-top: 10px;
margin-left: 80px;
}
.brandmark
{
margin-top: -20px;
}
.link_to a
{
color: #0050A0 !important;
}
.featured_div
{
display: none;
}
.featured_close_anchor, .featured_anchor_close
{
text-align: center;
}
#heading, #tag_line
{
top: -300px;
position:relative;
color: #0050A0;
}
#search
{
border-radius: 0 !important;
border-color: #0050A0 !important;
width: 60%;
height: 35px;
padding: 8px 15px;
color: #0050A0; /* change color of text to be typed inside search box */
font-size: 13px;
line-height: 20px;
background-color: transparent;
border: 1px solid #ccc;
-webkit-box-shadow: none;
box-shadow: none;
}
.btn-custom {
color: #FFFFFF;
background-color: #0050A0; /* change button color */
border-radius: 0!important; /* button border radius */
padding: 5px 11px; /* Button size change*/
margin-top: -3.5px;
border-top: 2px solid #0050A0;
border-bottom: 3px solid #0050A0;
margin-left: -3px;
}
.btn-custom:hover{
background-color:#9AC94B; /* change button color on hover */
border-radius: 0!important;
}
.left_categories
{
padding-top: 5px;
padding-bottom: 5px;
margin-bottom: 1px;
border-left: 4px solid #0050A0;
}
.left_categories:hover
{
border-top: 1px solid lightgrey;
border-bottom: 1px solid lightgrey;
border-left: 4px solid #E5002B;
}
.active_category
{
background-color: #0050A0;
color: white !important;
border-left: 4px solid #E5002B;
}
.search_section
{
margin-top: 30px;
}
a
{
text-decoration: none !important;
}
.flash_nav
{
height: 90px;
border: 0 !important;
background-color: #283442;
}
.gradient
{
background: -moz-linear-gradient(left, white 0%, white 45%, #12A8E0 85%, #0050A0 100%);
}
.flash_navbar a
{
color: black !important;
}
.search_form
{
width: 70%;
}
.nav_form
{
border-radius: 0;
margin-top: 27px;
}
#searchBar
{
border-color: #0050A0;
}
#searchButton
{
background-color: #0050A0;
color: white;
border: none;
}
<div id="home_div">
<div class="container" id="home_div_content">
<h1 id="heading">Find your product!</h1>
<h4 id="tag_line">Search what you are looking for.</h4>
<form method="GET" action="/product/search">
<input type="text" name="product" id="search" placeholder="Enter product name" class="searchTextBox" />
<button type="submit" id="quick-search" class="btn btn-custom"><span class="glyphicon glyphicon-search custom-glyph-color"></span></button>
</form>
<br />
view <i class="fa fa-chevron-down"></i> featuring
</div>
</div>
FIDDLE

Answer 1

An opacity rule will always affect child/descendant elements since they are part of the parent, and the rule says the parent should be 50% opacity.
To get round this, use a pseudo element and give that reduced opacity rather than the parent.
HTML
<div id='outer'>
<div id='inner'></div>
</div>
CSS
#outer { width: 200px; height: 200px; position: relative; padding: 2em; }
#outer::before { content: ''; position: absolute; left: 0; top: 0; width: 100%; height: 100%; background: red; opacity: .5; z-index: -1; }
#inner { width: 100%; height: 100%; background: blue; }
Fiddle.