Question:
I have a problem regarding the background of the web page, which I am terminating:
I only need to superimpose the entire part of the blog ON TOP of the matrix background and that everything looks good and centered.
Unfortunately I have not been able to specify it, I have tried with FIXED or ABSOLUTE and nothing. I also tried the z-index putting numbers in it and it didn't work for me either.
Here's the code:
var c = document.getElementById("c");
var ctx = c.getContext("2d");
c.height = window.innerHeight;
c.width = window.innerWidth;
var txts = "{{site.bgtext}}";
txts = txts.split("");
var font_size = 12;
var columns = c.width / font_size;
var drops = [];
for (var x = 0; x < columns; x++) drops[x] = 1;
function draw() {
ctx.fillStyle = "rgba(0, 0, 0, 0.05)";
ctx.fillRect(0, 0, c.width, c.height);
ctx.fillStyle = "#490";
ctx.font = font_size + "px arial";
for (var i = 0; i < drops.length; i++) {
var text = txts[Math.floor(Math.random() * txts.length)];
ctx.fillText(text, i * font_size, drops[i] * font_size);
if (drops[i] * font_size > c.height || Math.random() > 0.98) drops[i] = 0;
drops[i]++;
}
}
setInterval(draw, 20);
body {
font-family: monospace;
width: 900px;
margin: 0 auto;
padding: 70px;
}
#big-div {
height: 400px;
color: #34a507;
overflow: scroll;
}
.matrix-bg {
margin:0;
padding:0;
}
a {
color:red;
}
h2 {
text-align: center;
padding: 30px;
}
.container2 {
margin-top: 50px;
}
footer {
text-align: center;
margin-top: 50px;
}<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<!-- Styles CSS -->
<link type="text/css" href="styles.css">
<title>Hacker blog!</title>
</head>
<body>
<div class="matrix-bg">
<canvas id="c" height="700" width="1093"></canvas>
</div>
<div id="big-div" style="background-color: transparent;">
<div class="container0">
<nav class="navbar navbar-expand-lg navbar-light">
<div class="collapse navbar-collapse" id="navbarTogglerDemo02">
<ul class="navbar-nav mr-auto mt-2 mt-lg-0">
<li class="nav-item active">
<a class="nav-link" href="#">/Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">/Email </a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">/Github </a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
<h2>Hacker Personal Blog</h2>
</div>
<div class="container1">
<h3>Working on...</h3>
<table style="background-color: transparent;" class="table table-sm">
<thead>
<tr>
<th scope="col">#</th>
<th scope="col">Projects</th>
<th scope="col">With</th>
<th scope="col">On</th>
</tr>
</thead>
<tbody>
<tr>
<th scope="row">1</th>
<td>Hacking Facebook</td>
<td>Marc Zuckerberg</td>
<td>Linux</td>
</tr>
<tr>
<th scope="row">2</th>
<td>Government</td>
<td>Donald Trump</td>
<td>Windows XP</td>
</tr>
<tr>
<th scope="row">3</th>
<td>Your Mom</td>
<td>Whatsapp</td>
<td>Fridays</td>
</tr>
</tbody>
</table>
<h5>Download and Documentation: <a href="#">Here</a> </h5>
</div>
<div class="container2">
<h3>Post list, dates and stuffs</h3>
<ul style="background-color: transparent;" class="list-group">
<li class="list-group-item"><a href="#">amazing-hacking-project</a> Jul 16, 19</li>
<li class="list-group-item"><a href="#">how_fb_makesyou_stupid</a> May 25, 19</li>
<li class="list-group-item"><a href="#">the_rise_of_chicken_food</a> Apr 16, 19</li>
<li class="list-group-item"><a href="#">yourmom-project-github</a> Feb 04, 19</li>
<li class="list-group-item"><a href="#">your_sister_too-github</a> Jan 01, 19</li>
</ul>
</div>
<footer>contact: luisjoselopezd@gmail.com</footer>
</div>
<!-- Optional JavaScript -->
<script src="main.js"></script>
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>As you can see in the execution of the code with HTML, CSS, JS and Bootstrap you will realize what the problem is.
Answer:
You put the canvas fixed (top, right, bottom, left all 0) and with z-index -1
As failsafe for non-standard browsers you can also put:
width: 100vw;
height: 100vh;
width: 100%;
height: 100%;
var c = document.getElementById('c');
var ctx = c.getContext("2d");
c.height = window.innerHeight;
c.width = window.innerWidth;
var txts = "{{site.bgtext}}";
txts = txts.split("");
var font_size = 12;
var columns = c.width / font_size;
var drops = [];
for (var x = 0; x < columns; x++) drops[x] = 1;
function draw() {
ctx.fillStyle = "rgba(0, 0, 0, 0.05)";
ctx.fillRect(0, 0, c.width, c.height);
ctx.fillStyle = "#490";
ctx.font = font_size + "px arial";
for (var i = 0; i < drops.length; i++) {
var text = txts[Math.floor(Math.random() * txts.length)];
ctx.fillText(text, i * font_size, drops[i] * font_size);
if (drops[i] * font_size > c.height || Math.random() > 0.98) drops[i] = 0;
drops[i]++;
}
}
setInterval(draw, 20);body {
font-family: monospace;
width: 900px;
margin: 0 auto;
padding: 70px;
}
#big-div {
height: 400px;
color: #34a507;
overflow: scroll;
}
.matrix-bg {
margin:0;
padding:0;
}
a {
color:red;
}
h2 {
text-align: center;
padding: 30px;
}
.container2 {
margin-top: 50px;
}
footer {
text-align: center;
margin-top: 50px;
}
#c{
position:fixed;
top:0;
left:0;
right:0;
bottom:0;
z-index: -1
}<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<!-- Styles CSS -->
<link type="text/css" href="styles.css">
<title>Hacker blog!</title>
</head>
<body>
<div class="matrix-bg">
<canvas id="c" height="700" width="1093"></canvas>
</div>
<div id="big-div" style="background-color: transparent;">
<div class="container0">
<nav class="navbar navbar-expand-lg navbar-light">
<div class="collapse navbar-collapse" id="navbarTogglerDemo02">
<ul class="navbar-nav mr-auto mt-2 mt-lg-0">
<li class="nav-item active">
<a class="nav-link" href="#">/Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">/Email </a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">/Github </a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
<h2>Hacker Personal Blog</h2>
</div>
<div class="container1">
<h3>Working on...</h3>
<table style="background-color: transparent;" class="table table-sm">
<thead>
<tr>
<th scope="col">#</th>
<th scope="col">Projects</th>
<th scope="col">With</th>
<th scope="col">On</th>
</tr>
</thead>
<tbody>
<tr>
<th scope="row">1</th>
<td>Hacking Facebook</td>
<td>Marc Zuckerberg</td>
<td>Linux</td>
</tr>
<tr>
<th scope="row">2</th>
<td>Government</td>
<td>Donald Trump</td>
<td>Windows XP</td>
</tr>
<tr>
<th scope="row">3</th>
<td>Your Mom</td>
<td>Whatsapp</td>
<td>Fridays</td>
</tr>
</tbody>
</table>
<h5>Download and Documentation: <a href="#">Here</a> </h5>
</div>
<div class="container2">
<h3>Post list, dates and stuffs</h3>
<ul style="background-color: transparent;" class="list-group">
<li class="list-group-item"><a href="#">amazing-hacking-project</a> Jul 16, 19</li>
<li class="list-group-item"><a href="#">how_fb_makesyou_stupid</a> May 25, 19</li>
<li class="list-group-item"><a href="#">the_rise_of_chicken_food</a> Apr 16, 19</li>
<li class="list-group-item"><a href="#">yourmom-project-github</a> Feb 04, 19</li>
<li class="list-group-item"><a href="#">your_sister_too-github</a> Jan 01, 19</li>
</ul>
</div>
<footer>contact: luisjoselopezd@gmail.com</footer>
</div>
<!-- Optional JavaScript -->
<script src="main.js"></script>
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>