Troubleshooting issues with custom Bootstrap CSS implementation

I've been working on a website using Twitter Bootstrap and I wanted to add an interesting dynamic where an image starts off as grayscale and then transitions to full color when hovered over.

Instead of modifying the Bootstrap.css, I decided to create my own custom CSS file called 'starter-template.css'.
Below is the code snippet from 'starter-template.css':

.thumbnail2 {
-webkit-filter: grayscale(100%);
z-index: -9999999999999999999999999px;
-webkit-transition: all 0.9s ease-in-out;
-moz-transition: all 0.9s ease-in-out;
-o-transition: all 0.9s ease-in-out;
-ms-transition: all 0.9s ease-in-out;
transition: all 0.9s ease-in-out;
}

.thumbnail2:hover {
-webkit-filter: grayscale(0%);
z-index: -9999999999999999999999999px;
-webkit-transition: all 0.9s ease-in-out;
-moz-transition: all 0.9s ease-in-out;
-o-transition: all 0.9s ease-in-out;
-ms-transition: all 0.9s ease-in-out;
transition: all 0.9s ease-in-out;
}

Here's the corresponding HTML:

<!-- Custom styles for this template -->
<link href="static/starter-template.css" type = "text/css" rel="stylesheet">

....

<a href="{{my_link}}"><img class="thumbnail2" src="{{my_string}}" align="right" height="200" width="200"></a>

However, I'm facing an issue where the hover effect doesn't seem to work as intended – the image isn't transitioning to full color on hover. Any advice or suggestions would be greatly appreciated!

Thanks in advance!

Answer №1

Have you considered adjusting your z-index value as a possible solution? Check out this example: http://jsfiddle.net/c8wtbjfw/

.thumbnail2 {
    -webkit-filter: grayscale(100%);
    z-index: -9999999999999999999999999;
    -webkit-transition: all 0.9s ease-in-out;
    -moz-transition: all 0.9s ease-in-out;
    -o-transition: all 0.9s ease-in-out;
    -ms-transition: all 0.9s ease-in-out;
    transition: all 0.9s ease-in-out;
}
.thumbnail2:hover {
    -webkit-filter: grayscale(0%);
    z-index: -9999999999999999999999999;
    -webkit-transition: all 0.9s ease-in-out;
    -moz-transition: all 0.9s ease-in-out;
    -o-transition: all 0.9s ease-in-out;
    -ms-transition: all 0.9s ease-in-out;
    transition: all 0.9s ease-in-out;
}

Testing reveals success in Chrome (36.0.1985.143), yet note that Webkit filters may not function in IE or Gecko-based browsers.

An alternative suggestion could involve transitioning the opacity property, which boasts widespread support. Explore this CSS approach utilizing opacity instead: http://jsfiddle.net/c8wtbjfw/1/

.thumbnail2 {
    opacity: .5;
    -webkit-transition: all 0.9s ease-in-out;
    -moz-transition: all 0.9s ease-in-out;
    -o-transition: all 0.9s ease-in-out;
    -ms-transition: all 0.9s ease-in-out;
    transition: all 0.9s ease-in-out;
}
.thumbnail2:hover {
    opacity:1;
    -webkit-transition: all 0.9s ease-in-out;
    -moz-transition: all 0.9s ease-in-out;
    -o-transition: all 0.9s ease-in-out;
    -ms-transition: all 0.9s ease-in-out;
    transition: all 0.9s ease-in-out;
}

The z-index attribute has been removed, as its intended purpose in positioning the image "under" the page content was unclear.

Answer №2

Here is a suggestion for you to try:

.thumbnail2 {
    filter: url(filters.svg#grayscale); /* Firefox 3.5+ */
    filter: gray; /* IE5+ */
    -webkit-filter: grayscale(100%); /* Webkit Nightlies & Chrome Canary */
    z-index: -9999999999999999999999999;
-webkit-transition: all 0.9s ease-in-out;
-moz-transition: all 0.9s ease-in-out;
-o-transition: all 0.9s ease-in-out;
-ms-transition: all 0.9s ease-in-out;
transition: all 0.9s ease-in-out;
}

.thumbnail2:hover {
    filter: none;
    -webkit-filter: grayscale(0);
    z-index: -9999999999999999999999999;
-webkit-transition: all 0.9s ease-in-out;
-moz-transition: all 0.9s ease-in-out;
-o-transition: all 0.9s ease-in-out;
-ms-transition: all 0.9s ease-in-out;
transition: all 0.9s ease-in-out;
}

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