My navbar is disappearing even after having position sticky - html

Question

my navbar is disappearing even after having position sticky.
My code was working till the about section so the div container is already change but so I did the same as about section in the forwarded/next section and this time the navbar disappeared which doesn't seem correct.
* {
margin: 0;
padding: 0;
font-family: 'Montserrat', sans-serif;
}
html {
scroll-behavior: smooth;
}
/* CSS Variables */
:root {
--navbar-height: 59px;
}
#navbar {
display: flex;
align-items: right;
position: sticky;
top: 0px;
justify-content: right;
}
#navbar::before {
content: "";
background-color: rgb(15, 15, 15);
position: absolute;
top: 0px;
left: 0px;
height: 100%;
width: 100%;
z-index: -1;
opacity: 1;
}
/* Navigation Bar: Logo and Image */
#logo {
margin: auto;
position: sticky;
flex-direction: row;
align-items: center;
}
#logo h1 {
color: rgb(255, 255, 255);
margin: auto;
position: sticky;
font-size: 1.8vw;
font-weight: 800;
font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
animation-name: loco;
animation-duration: 3s;
animation-timing-function: ease-in-out;
animation-iteration-count: infinite;
}
#keyframes loco {
0% {
color: rgb(120, 255, 255);
}
25% {
color: rgb(85, 255, 141);
}
50% {
color: rgb(182, 255, 194);
}
75% {
color: rgb(50, 255, 203);
}
100% {
color: rgb(100, 255, 148);
}
}
/* Navigation Bar: List Styling */
#navbar ul {
display: flex;
}
#navbar ul li {
list-style: none;
font-size: 1vw;
margin: 5px 2px;
}
#navbar ul li a {
color: #ffffff;
display: block;
padding: 8px 44px;
margin: -2px 11px;
text-decoration: none;
font-weight: 900;
font-size: large;
border-radius: 0px;
transition: all 0.5s;
}
#navbar ul li a {
transition-timing-function: ease-in-out;
font-size: 1.5rem;
}
#navbar ul li a:hover {
border-radius: 20px;
color: rgb(0, 255, 136);
border-radius: 20px;
text-shadow: 0 0 10px #00ff55;
}
/* Home */
#home {
display: flex;
justify-content: left;
align-items: center;
height: 950px;
}
#home h1 {
font-family: 'Radio Canada';
font-size: 7vw;
text-align: center;
text-transform: capitalize;
color: #FFFFFF;
text-shadow: 5px 5px 4px #0047FF;
margin-left: 39px;
}
#home::before {
content: "";
position: absolute;
width: 100%;
height: 100%;
background: url(images/traxer-4PljbcYIzyE-unsplash\ \(1\).jpg)no-repeat center center/cover;
box-shadow: inset 529px 4px 250px 10px rgb(0, 0, 0, 90);
filter: blur(1.5px);
top: 0px;
left: 0px;
z-index: -1;
}
/*About- Section*/
#about {
display: flex;
align-items: center;
flex-direction: column;
flex-wrap: wrap;
align-content: center;
justify-content: center;
}
#about::before {
content: "";
position: absolute;
width: 100%;
height: 100%;
background: url(/images/closeup-golden-bitcoins-dark-reflective-surface-histogram-decreasing-crypto.jpg)no-repeat center center/cover;
box-shadow: inset 529px 4px 250px 10px rgb(0, 0, 0, 90);
filter: blur(1.5px);
top: 950px;
left: 0px;
z-index: -2;
}
#about h1 {
/* position: absolute; */
width: 798.53px;
height: 78px;
margin-top: 80px;
font-family: 'Montserrat';
font-style: normal;
font-weight: 700;
font-size: 5vw;
line-height: 78px;
text-align: center;
color: #ffffff;
}
#about p {
/* position: absolute; */
width: 777.37px;
height: 462px;
margin-top: 113px;
font-family: 'Montserrat';
font-style: normal;
font-weight: 100;
font-size: 2vw;
line-height: 59px;
text-align: center;
color: #ffffff;
}
#about .btn {
width: 474.93px;
/* height: 60px; */
font-family: 'Montserrat';
font-style: normal;
font-weight: 600;
font-size: 2.4vw;
line-height: 59px;
text-align: center;
justify-content: center;
/* margin: -44px 152px 28px 152px;*/
}
#about .btn a {
border-radius: 9px;
color: #ffc400;
/* background:black; */
text-decoration: none;
border-radius: 10px;
text-shadow: 0px 0px 5px rgb(255, 238, 0);
padding: 5px 5px;
transition: all 1s;
}
#about .btn a:hover {
background: none;
color: rgb(0, 255, 149);
border-radius: 10px;
text-shadow: 0px 0px 10px rgb(0, 255, 149);
}
/* ---charts section */
#chart {
display: flex;
}
#chart::before {
content: "";
position: absolute;
width: 100%;
height: 100%;
background: url(/images/maxim-hopman-fiXLQXAhCfk-unsplash.jpg)no-repeat center center/cover;
box-shadow: inset 200px 4px 250px 10px rgb(0, 0, 0, 90);
filter: blur(1.5px);
top: 1920px;
left: 0px;
filter: brightness(0.5);
z-index: -2;
}
<link href='https://fonts.googleapis.com/css?family=Montserrat' rel='stylesheet'>
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Montserrat&display=swap" rel="stylesheet">
<link href="https://fonts.googleapis.com/css2?family=Radio+Canada:wght#700&display=swap" rel="stylesheet">
<nav id="navbar">
<div id="logo">
<h1>All Crypto</h1>
</div>
<ul>
<li class="item"> Home</li>
<li class="item"> About</li>
<li class="item"> Chart</li>
<li class="item"> News</li>
</ul>
</nav>
<div id="home">
<h1>Crypto <br> At Your <br> Fingertips</h1>
</div>
<div id="about">
<h1>What Is CryptoCurrency</h1>
<!-- <div id="img">
<img src="/images/NFT_4.png" alt="">
</div> -->
<p>A cryptocurrency, crypto<br>currency, or crypto is a digital<br> currency designed to work as <br> a medium of exchange through<br> a computer network that is not<br> reliant on any central<br>authority.....</p>
<div class="btn">
Read More
</div>
</div>
<div id="chart">
</div>

Answer 1

I think you should use position:fixed instead of position:sticky. And set the width to 100% to fit the screen. Here's the code:
#navbar {
display: flex;
align-items: right;
position: fixed;
top: 0px;
width: 100%;
justify-content: right;
}

Answer 2

The problem is not with the #about section; it lies with the #chart section. You should have some kind of dimensions to the chart section, e.g.:
#chart {
display:flex;
height:100em;
}
Also, it doesn't look like you have much reason to be using a pseudo element for what looks like the image. I would recommend setting the background image to #chart, and not #chart::before.
Since your header doesn't seem to require a sticky position, please think about using position:fixed;.