Challenge Responsively Style Radio Buttons - ashish9342/FreeCodeCamp GitHub Wiki
You can use Bootstrap's col-xs-* classes on form elements. That will make radio buttons evenly spread out across the page regardless of how wide the screen might be.
Nest all of your radio buttons within a <div class="row"> element. Then nest each of them within a <div class="col-xs-6"> element.
<form action="/submit-cat-photo">
<div class="row">
<div class="col-xs-6"><label><input type="radio" name="indoor-outdoor"> Indoor</label></div>
<div class="col-xs-6"><label><input type="radio" name="indoor-outdoor"> Outdoor</label></div>
<div class="col-xs-6"><label><input type="checkbox" name="personality"> Loving</label></div>
<div class="col-xs-6"><label><input type="checkbox" name="personality"> Lazy</label></div>
<div class="col-xs-6"><label><input type="checkbox" name="personality"> Crazy</label></div>
</div>
<input type="text" placeholder="cat photo URL" required>
<button type="submit">Submit</button>
</form>