How to add a backdrop over a div (lightbox effect)? - html

Question

i'm editing an AngularJS project and i want to add a backdrop (like Bootstrap Modal) over the main DIV when users click on search input box.
Here is the HTML code:
<div class="main-box">
<div class="search-function" ng-click="showInputForm()">
<img src="../images/my_project/search.png">
</div>
<div class="search-form" ng-if="showForm">
<form ng-submit="textSearch()">
<input type="text" autofocus class="search-input" ng-model="text.value" />
</form>
</div>
</div>
As you can see the white box appears when users click on the search icon and now i want to add a backdrop over the main DIV, except on the white box.
Here is the LESS code:
.search-function {
margin-left: 30%;
}
.search-form {
padding-left: 15%;
padding-right: 15%;
position: relative;
z-index: 0;
.search-input {
color: #2b84a6 !important;
background-color: #fff !important;
font-weight: 300;
font-size: 16px;
}
}
How can i reach this?

Answer 1

Something like this
<div class="main-box">
<div class="backdrop" ng-if="showForm"></div>
<div class="search-function" ng-click="showInputForm()">
<img src="../images/my_project/search.png">
</div>
<div class="search-form" ng-if="showForm">
<form ng-submit="textSearch()">
<input type="text" autofocus class="search-input" ng-model="text.value" />
</form>
</div>
</div>
And add the CSS as
.backdrop {
position: absolute;
left: 0;
right: 0;
top: 0;
bottom: 0;
background: black;
opacity: 0.5;
}

Answer 2

Here's a very complete article about different methods of achieving what you need
CSS Overlay Techniques