html - position radio buttons elements over background image

Question

I have a backgorund image and want to position some radio buttons (the circle of the radio button will be hidden and only the label will appear) just close to the red triangles (as shown here) . How can I do this? Please see my code here

input[type="radio"] {
  display: none;
}
input[type="radio"]:checked + label {
  border: 2px solid red;
}

<img src="http://i.stack.imgur.com/CUTm6.png" alt="Synoptic table" align="center">
<div class="buton">
  <input type="radio" name="a" value="a" id="a" />
  <label for="a">text radio 1</label>
</div>
<div class="buton">
  <input type="radio" name="a" value="b" id="b" />
  <label for="b">text radio 2</label>
</div>
<div class="buton">
  <input type="radio" name="a" value="c" id="c" />
  <label for="c">text radio 3</label>
</div>

Answer 1

Ok, managed to solve that. I put the position as a style in the div that includes the radio button

<div class="buton" style="position:absolute; left:400px; top:250px">
  <input type="radio" name="a" value="b" id="b" /> <label for="b"> radio text 2 </label>
</div>