Custom radio selector not functioning - html

Question

I've created this custom radio selector for my site and the first radio selector is working but the 2nd field isn't selecting. Is there another class that I need to create or have each input named a different ID so they don't conflict with one another? I'm trying to create multiple options for a customer to select an option.
input[type=radio] {
position: absolute;
visibility: hidden;
display: none;
}
label {
display: inline-block;
cursor: pointer;
font-weight: bold;
padding: 5px 20px;
}
input[type=radio]:checked+label {
color: #fff;
background: #444;
border-radius: 5px;
}
label+input[type=radio]+label {
border-left: solid 3px #444;
}
.radio-group {
display: inline-block;
overflow: hidden;
}
<div class="radio-group">
<input type="radio" id="lessthan6months" name="timeline"><label for="lessthan6months">6 mo</label>
<input type="radio" id="6to12months" name="timeline"><label for="6to12months">6-12 mo</label>
<input type="radio" id="12to24months" name="timeline"><label for="12to24months">12-24 mo</label>
<div class="line"></div>
</div>
<div class="radio-group">
<input type="radio" id="tradein_y" name="tradein" value="Yes"><label for="trade in yes">Yes</label>
<input type="radio" id="tradein_n" name="tradein" value="No"><label for="trade in no">No</label>
<div class="line"></div>
</div>

Answer 1

The for of the label content has to match the id of the input.
This will work, like this:
input[type=radio] {
position: absolute;
visibility: hidden;
display: none;
}
label {
display: inline-block;
cursor: pointer;
font-weight: bold;
padding: 5px 20px;
}
input[type=radio]:checked+label {
color: #fff;
background: #444;
border-radius: 5px;
}
label+input[type=radio]+label {
border-left: solid 3px #444;
}
.radio-group {
display: inline-block;
overflow: hidden;
}
<div class="radio-group">
<input type="radio" id="lessthan6months" name="timeline"><label for="lessthan6months">6 mo</label>
<input type="radio" id="6to12months" name="timeline"><label for="6to12months">6-12 mo</label>
<input type="radio" id="12to24months" name="timeline"><label for="12to24months">12-24 mo</label>
<div class="line"></div>
</div>
<div class="radio-group">
<input type="radio" id="tradein_y" name="tradein" value="Yes"><label for="tradein_y">Yes</label>
<input type="radio" id="tradein_n" name="tradein" value="No"><label for="tradein_n">No</label>
<div class="line"></div>
</div>