Media query not working on HTML form - html

Question

I would like the font size for my form label and input fields to scale down from 18px to 10px when the browser width reaches 1460px or less.
I read that it is not possible to get fonts to automatically 'scale down' as such when the browser width decreases, and that I would need to use media queries instead.
Therefore I have put a media query at the top of my style tags asking the font size for my label and input to display at 10px when the screen size is 1460px, but it doesn't seem to work. The rest of my code is working fine however, so it must be something to do with the way I am coding my media query.
If someone could offer some help that would be much appreciated.. my code is pasted below.
#media only screen and (max-width: 1460px) {
label input {
font-size: 10px;
}
}
* {
box-sizing: border-box;
}
input[type=text],
select {
width: 95%;
padding: 12px;
border: 1px solid #ccc;
border-radius: 3px;
resize: vertical;
transition: 0.3s;
outline: none;
font-family: Typ1451-Medium;
font-size: 18px;
margin: 7px;
}
input[type=text]:focus {
border: 1.25px solid #ea0088;
}
label {
padding: 21px 12px 12px 12px;
margin-left: 5px;
display: inline-block;
font-family: Typ1451-Medium;
font-size: 18px;
color: #999;
}
.container {
border-radius: 5px;
background-color: #f2f2f2;
padding: 20px;
margin: 2.5% 20% 0 20%;
}
.col-25 {
float: left;
width: 25%;
margin-top: 6px;
}
.col-75 {
float: left;
width: 75%;
margin-top: 6px;
}
.left,
.right {
width: 50%;
}
form {
display: flex;
}
<div class="container">
<form action="signin.php" method="post">
<div class="left">
<div class="row">
<div class="col-25">
<label for="fname">First Name</label>
</div>
<div class="col-75">
<input type="text" id="fname" name="firstname" placeholder="* Please complete">
</div>
</div>
</div>
<div class="right">
<div class="row">
<div class="col-25">
<label for="lname">Last Name</label>
</div>
<div class="col-75">
<input type="text" id="lname" name="lastname" placeholder="* Please complete">
</div>
</div>
</div>
</form>
</div>

Answer 1

Your selector — label input — doesn't match any elements in your HTML.
None of your input elements are descendants of your label elements.
Perhaps you meant label, input to select label elements and input elements. If so, then it still wouldn't work because you define the input font-size with a more specific selector later on (and the most specific selector wins the cascade) and the label in a similar way (it doesn't have a more specific selector, but when selectors are equal, the last one wins the cascade).

Answer 2

Actually, you CAN scale fonts up or down with the viewport size. There is a method with calc() and vw units:
Basically you do something like font-size: 3vw and then set max and min font sizes.
Here is a link to the calculation on Smashing Magazine. The rest of the article is pretty interesting, too.
You can extend this even further and optimize the font size with media queries.
Have fun! :)