JSFiddle - React, Tailwind, and code Playground

HTML

<h1>Stunden</h1>
<br>

<form name="form1" method="post" action="">
Tag1 
... Zeit von: <select id="von_01" name="von_01">

<option value="00:00">00:00</option>
<option value="00:30">00:30</option>
<option value="01:00">01:00</option>
<option value="01:30">01:30</option>
<option value="02:00">02:00</option>
<option value="02:30">02:30</option>
<option value="03:00">03:00</option>
<option value="03:30">03:30</option>
<option value="04:00">04:00</option>
<option value="04:30">04:30</option>
<option value="05:00">05:00</option>
<option value="05:30">05:30</option>
<option value="06:00">06:00</option>
<option value="06:30">06:30</option>
<option value="07:00">07:00</option>
<option value="07:30">07:30</option>
<option value="08:00">08:00</option>
<option value="08:30">08:30</option>
<option value="09:00">09:00</option>
<option value="09:30">09:30</option>
<option value="10:00">10:00</option>
<option value="10:30">10:30</option>
<option value="11:00">11:00</option>
<option value="11:30">11:30</option>
<option value="12:00">12:00</option>
<option value="12:30">12:30</option>
<option value="13:00">13:00</option>
<option value="13:30">13:30</option>
<option value="14:00">14:00</option>
<option value="14:30">14:30</option>
<option value="15:00">15:00</option>
<option value="15:30">15:30</option>
<option value="16:00">16:00</option>
<option value="16:30">16:30</option>
<option value="17:00">17:00</option>
<option value="17:30">17:30</option>
<option value="18:00">18:00</option>
<option value="18:30">18:30</option>
<option value="19:00">19:00</option>
<option value="19:30">19:30</option>
<option value="20:00">20:00</option>
<option value="20:30">20:30</option>
<option value="21:00">21:00</option>
<option value="21:30">21:30</option>
<option value="22:00">22:00</option>
<option value="22:30">22:30</option>
<option value="23:00">23:00</option>
<option value="23:30">23:30</option>
<option value="00:00">00:00</option>
</select>
Zeit bis: <select id="bis_01"...

CSS

.greybox { 
	margin:12px 4px; 
	padding:6px; 
	background:#DEDEDE; 
	color:#000066; 
	text-align:left; 
}

JavaScript

$(document).ready(function () { 
    
$( "select" ).change(function () { 
	var text = $("select option:selected").text();
	var value = $("select option:selected").val();
	
	var outstr = ""; 
	outstr += "Selected text = " + text + "<br>\n"; 
	outstr += "Selected value = " + value + "<br>\n";

	$("#testout").html ( outstr ); 
	
});


});