JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<div class="container">
    <div class="row">
        <div class="col-md-8">
            <div id="viewHours">
                <div class="btn-group">
                    <label class="btn btn-default">
                        <input type="radio" value="08:00" name="optHour" />08:00</label>
                    <label class="btn btn-default">
                        <input type="radio" value="08:30" name="optHour" />08:30</label>
                    <label class="btn btn-default">
                        <input type="radio" value="09:00" name="optHour" />09:00</label>
                    <label class="btn btn-default">
                        <input type="radio" value="09:30" name="optHour" />09:30</label>
                    <label class="btn btn-default">
                        <input type="radio" value="10:00" name="optHour" />10:00</label>
                    <label class="btn btn-default">
                        <input type="radio" value="10:30" name="optHour" />10:30</label>
                    <label class="btn btn-default">
                        <input type="radio" value="11:00" name="optHour" />11:00</label>
                    <label class="btn btn-default">
                        <input type="radio" value="11:30" name="optHour" />11:30</label>
                    <label class="btn btn-default">
                        <input type="radio" value="13:00" name="optHour" />13:00</label>
                    <label class="btn btn-default">
                        <input type="radio" value="13:30" name="optHour" />13:30</label>
                    <label class="btn btn-default">
                        <input type="radio" value="14:00" name="optHour" />14:00</label>
                    <label class="btn btn-default">
                        <input type="radio" value="14:30"...

CSS

#viewHours .btn-group>.btn {
    border-radius: 0;
    margin:0;
}