Change font-size based on selected option

Question

I would like the first-child in the option to have a different font-size. I'm trying various methods but it isn't happening. So far, I've got this:

JSFiddle: https://jsfiddle.net/2n9cfyo0/1/

I want it to appear this way by default (this is the first-child):

but change the font-size to 24px when the dropdown is chosen:

 select { -moz-appearance: none; -webkit-appearance: none; appearance: none; padding: 7px 15px; border: 1px solid #333; border-radius: 2px; font-size: 24px; }.target option:first-child { font-size: 12; }

 <select class="target"> <option value="">select</option> <option value="1">option 1</option> <option value="2">option 2</option> </select>

Answer 1

I've created a jsfiddle to achieve the same result that is required. It would require javascript & jquery to achieve the result you're expecting. Changing the dropdown from one form to another is an Event , and Events exists in Jquery , in your case, we've to use .change() event.

Add the below javascript code:

$(".target").change(function(){
   if (this.value == "2") {
     $(this).css({"font-size" : "34px"});
   }
});

the above code says that when you select Option 2 from the dropdown, it would change the size of font to 34px; , you can modify the fiddle according to your needs:)

 $(".target").change(function() { if (this.value == "2") { $(this).css({ "font-size": "34px" }); } });

 select { -moz-appearance: none; -webkit-appearance: none; appearance: none; padding: 7px 15px; border: 1px solid #333; border-radius: 2px; font-size: 24px; }.target option:first-child { font-size: 12; }

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <select class="target"> <option value="">select</option> <option value="1">option 1</option> <option value="2">option 2</option> </select>