CSS to open text box when clicking on image - css

Question

I have a SharePoint 2010 site and would like to use CSS only in the wikipage.
On my page I have a paragraph of information and at the end of it, has a question. After the viewers read the information and the question I would like them to be able to click on an image that says 'answer'. When clicking on the 'answer' image a text box comes up under the question with the answer. I would like the answer to stay on the page, not just hovering over the image.
My preference is to do this solely in css. I don't think I have the capabilities to do it in javascript.
I'm open to both options, I guess. If it is javascript can it be done inline?

Answer 1

Like mentioned by #JofryHS, css doesn't really respond to clicks.
Using inline js click handlers isn't great as it'll leave you having to repeat yourself a lot, but from the sounds of things you're fighting against not having enough access to Sharepoint (sigh, corporate networks).
This uses an inline click handler to show the answer:
<div class="question" id="q1">
What colour is the sky?
<button class="answerButton" onClick="document.getElementById('q1Answer').style.display='block'">Answer</button>
<div class="answer" id="q1Answer">
Overcast and grey, because I live in the UK.
</div>
</div>
<div class="question" id="q2">
Why does it always rain on me?
<button class="answerButton" onClick="document.getElementById('q2Answer').style.display='block'">Answer</button>
<div class="answer" id="q2Answer">
I'd have thought you figured this out already... It's Britain, of course it always rains on you!
</div>
</div>
the answers are hidden using css (note the display:none inside the .answer block):
.answer {
display:none;
background-color:#e5e5ff;
padding:15px;
}
.question {
background-color:#f5f5f5;
padding:15px;
border-radius:5px;
margin:7px;
}
Essentially, all the onClick does is change the css of the answer from display:none to display:block, rendering the answer visible.
There's also a tad of css to make it look shinier, and here's a demo jsfiddle