Responsive Navbar icon not working - html

Question

Okay, so I was trying to make a responsive navbar when I saw this pen on codepen.io in which the guy made a responsive navbar using pure CSS.
I was wondering if I could do the same thing, so I was trying to replicate it and I did most of the things, but I have a problem. when I click on the menu icon, it doesn't do anything.
Here's My Code
index.html
.navbar {
height: 50px;
width: 100%;
background: #333;
position: absolute;
top: 0;
left: 0;
color: white;
font-family: Arial;
}
.navbar h3 {
float: left;
margin-left: 20px;
margin-top: 14px;
}
.navbar .nav-links a {
float: right;
padding: 15px;
color: white;
text-decoration: none;
}
.navbar a:hover {
float: right;
padding: 15px;
background: #555;
color: white;
text-decoration: none;
}
.navbar span,
.navbar input {
display: none;
}
#media (max-width: 550px) {
.navbar .nav-links a {
display: none;
}
.navbar span {
float: right;
font-size: 30px;
margin-right: 20px;
display: block;
}
.navbar input[type="checkbox"] {
display: none;
}
}
<div class="navbar">
<h3>Augma Tech</h3>
<div class="nav-links" id="nav-links">
Contact
Services
Home
</div>
<span>
<label for="check">☰</label>
<input type="checkbox" name="check" id="check">
</span>
</div>
.navbar {
height: 50px;
width: 100%;
background: #333;
position: absolute;
top: 0;
left: 0;
color: white;
font-family: Arial;
}
.navbar h3 {
float: left;
margin-left: 20px;
margin-top: 14px;
}
.navbar .nav-links a {
float: right;
padding: 15px;
color: white;
text-decoration: none;
}
.navbar a:hover {
float: right;
padding: 15px;
background: #555;
color: white;
text-decoration: none;
}
.navbar span,
.navbar input {
display: none;
}
#media (max-width: 550px) {
.navbar .nav-links a {
display: none;
}
.navbar span {
float: right;
font-size: 30px;
margin-right: 20px;
display: block;
}
.navbar input[type="checkbox"] {
display: none;
}
}

Answer 1

According the codepen that you attach:https://codepen.io/jo_Geek/pen/xgbaEr
Here is working code:
See fiddle:https://jsfiddle.net/d07g34zv/10/
* {
box-sizing: border-box;
}
body {
margin: 0px;
font-family: Arial;
}
.nav {
height: 50px;
width: 100%;
background-color: #4d4d4d;
position: relative;
}
.nav > .nav-header {
display: inline;
}
.nav > .nav-header > .nav-title {
display: inline-block;
font-size: 22px;
color: #fff;
padding: 10px 10px 10px 10px;
}
.nav > .nav-btn {
display: none;
}
.nav > .nav-links {
display: inline;
float: right;
font-size: 18px;
}
.nav > .nav-links > a {
display: inline-block;
padding: 13px 10px 13px 10px;
text-decoration: none;
color: #efefef;
}
.nav > .nav-links > a:hover {
background-color: rgba(0, 0, 0, 0.3);
}
.nav > #nav-check {
display: none;
}
#media (max-width:600px) {
.nav > .nav-btn {
display: inline-block;
position: absolute;
right: 0px;
top: 0px;
}
.nav > .nav-btn > label {
display: inline-block;
width: 50px;
height: 50px;
padding: 13px;
}
.nav > .nav-btn > label:hover {
background-color: rgba(0, 0, 0, 0.3);
}
.nav > .nav-btn > label > span {
display: block;
width: 25px;
height: 10px;
border-top: 2px solid #eee;
}
.nav > .nav-links {
position: absolute;
display: block;
width: 100%;
background-color: #333;
height: 0px;
transition: all 0.3s ease-in;
overflow-y: hidden;
top: 50px;
left: 0px;
}
.nav > .nav-links > a {
display: block;
width: 100%;
}
.nav > #nav-check:not(:checked) + .nav-links {
height: 0px;
}
.nav > #nav-check:checked + .nav-links {
height: calc(100vh - 50px);
overflow-y: auto;
}
}
<div class="nav">
<div class="nav-header">
<div class="nav-title">
Augma Tech
</div>
</div>
<div class="nav-btn">
<label for="nav-check">
<span></span>
<span></span>
<span></span>
</label>
</div>
<input type="checkbox" id="nav-check">
<div class="nav-links">
Contact
Services
Home
</div>
</div>