Underlinde text when mouse over

Hello, i have this peace of script
<script src=”//code.jquery.com/jquery-1.11.3.min.js”></script>
<script>
$(document).ready(function(){
$(“.text1”).click(function(){
$(“.text1nezobrazeny”).toggle(“slow”);
});
});
</script>

<div class=”text1″>click for show</div>
<div class=”text1nezobrazeny” style=”display: none; padding: 0px;”>show it</div>

I wanna when i my mouse over text “click for show” it will be underline?

i tried .text1:hover {text-decoration:underline;} >> not working
https://heliocare.net/science.html u can see here what id like have

this is my page https://heliocare.neomed.cz/doporuceni/