How to set canvas height to the maximum available height - html

Question

I have a header on my website and I want to be able to set my canvas to fill all of the remaining height.
This is the Code:
<div include-html="../global/navbar.html">
<ul class="navbar">
<li class="navbar">Ben</li>
<li class="navbar">Projects</li>
</ul>
</div>
<div class="CanvasContainer">
<canvas id="Canvas" height="440" width="200">
</canvas>
</div>
canvas {
padding: 0;
margin: auto;
display: block;
width: 400px;
}
body {
padding: 0;
margin: 0;
background-color: #17141d;
color: white;
font-family: 'DM Mono', monospace;
}
ul.navbar {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #17141d;
}
li.navbar {
float: left;
}
li.navbar a{
display: block;
padding: 14px 16px;
}
a {
font-size: 20px;
text-align: center;
text-decoration: none;
background-color: #17141d;
color: white;
}
a:hover {
background-color: #262130;
background: linear-gradient(90deg,#ff8a00,#e52e71);
-webkit-text-fill-color: transparent;
background-clip: text;
-webkit-background-clip: text;
}
function LoadCanvas(){
var canvas = document.getElementById("Canvas");
var ctx = canvas.getContext("2d");
ctx.fillStyle = "#FF0000";
ctx.fillRect(0, 0, 150, 75);
}
height:100%; sets the height to the height of the window
Filler so stackoverflow lets me save the edit:
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Answer 1

One way to take up the remaining space with the canvas would be to use flexbox.
In the following I use the property flex: 1 to tell the container to take the remaining space.
function LoadCanvas() {
var canvas = document.getElementById("Canvas");
var ctx = canvas.getContext("2d");
ctx.fillStyle = "#FF0000";
ctx.fillRect(0, 0, 150, 75);
}
canvas {
padding: 0;
margin: auto;
display: block;
width: 400px;
height: 100%;
}
body {
padding: 0;
margin: 0;
background-color: #17141d;
color: white;
font-family: "DM Mono", monospace;
display: flex;
height: 100vh;
flex-direction: column;
}
.CanvasContainer {
display: flex;
flex: 1;
}
ul.navbar {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #17141d;
}
li.navbar {
float: left;
}
li.navbar a {
display: block;
padding: 14px 16px;
}
a {
font-size: 20px;
text-align: center;
text-decoration: none;
background-color: #17141d;
color: white;
}
a:hover {
background-color: #262130;
background: linear-gradient(90deg, #ff8a00, #e52e71);
-webkit-text-fill-color: transparent;
background-clip: text;
-webkit-background-clip: text;
}
<div include-html="../global/navbar.html">
<ul class="navbar">
<li class="navbar">Ben</li>
<li class="navbar">Projects</li>
</ul>
</div>
<div class="CanvasContainer">
<canvas id="Canvas"> </canvas>
</div>