Hamburger icon not showing on screen width less than 500px? - html

Question

I have searched but nothing has helped. I cannot get the hamburger menu to show up. It originally showed correctly when screen width was less than 500px (which is what I wanted) but now it won't and I can't find what change has made it disappear. I feel like its a simple answer but I cannot figure it out.
Link to my pen: https://codepen.io/idfc/pen/gBdmPK
background-image: linear-gradient(to right top, #051937, #004d7a,
#008793, #00bf72, #a8eb12);
<div class="top">
<div class="nav-bar">
<input type="checkbox" id="toggle">
<label for="toggle" class="hamburger">
<span> </span>
<span> </span>
<span> </span>
</label>
<div class="Logo">Logo</div>
<div class="nav-links">
Home
About
Links
Contact
</div>
</div>
</div>
and css;
.top {
background-image: linear-gradient(to right top, #051937, #004d7a,
#008793, #00bf72, #a8eb12);
}
.beaker {
display: none;
}
h1 {
margin-left: 5%;
margin-right: 5%;
}
#toggle {
display: none;
}
.Logo {
color: white;
font-size: 22px;
}
a {
display: none;}
.hamburger {
display: block;
margin: 0;
}
.hamburger span {
display: block;
width: 35px;
background-color: white;
height: 5px;
}
.calculator {
display: none;
}
#media only screen and (min-width: 500px) {
a {
display: inline;
font-size: 18px;
text-decoration: none;
color: white;
margin-right: 80px;
margin-left: 5px;
}
a:hover {
color: black;
}
.beaker {
display: block;
width: 500px;
height: 500px;
margin-left: 30%;
box-shadow: 20px 20px 10px grey;
}
.calculator {
display: block;
box-sizing: border-box;
max-width: 400px;
margin: 0 auto;
background-color: #f6f6f6;
border: 4px solid black;
border-radius: 5px;
box-shadow: 20px 20px grey;
}
.calculator input {
background: none ;
border: none;
box-shadow: none;
border: none;
width: 100%;
border-bottom: 2px solid #111;
padding: 20px;
text-align: right;
font-size: 40px;
}
.calc-buttons {
font-size: 42px;
border-radius: 5px;
cursor: pointer;
background: rgba(0, 0, 0, 0.5);
border: 1px solid #111;
padding: 20px;
margin-left: 10px;
}
.calculator-buttons {
display: grid;
grid-template-columns: 1fr 1fr 1fr 1fr;
grid-gap: 15px;
}
.is-clear {
grid-column: span 3;
background-color: blue;
}
.is-equals {
grid-column: span 3;
background-color: green;
}
}
.hamburger {
display: none;
}
.Logo {
margin-left: 5px;
font-size: 20px;
padding-top: 5px;
}
.words {
margin-top: 50px;
}

Answer 1

Because you're using the display: none property on the .hamburger class, line 123. Remove that and it will appear.
To hide above screen size of 500px:
#media only screen and (min-width: 500px) {
.hamburger {
display: none;
}
}