I'm new to this. I'm trying to make a webpage with 100vh height, where the header and footer will take 80px and 50px respectively. Whatever space is left in middle should be taken over by a grid container completely. I did succeed so far, but the middle container is taking only as much as its content needs. Please see the below image for refrence:

Also, I was under the impression that the footer tag will put the section at the bottom of the viewport automatically. But that's not happening either. Do I have to use absolute positioning?
* {
margin: 0px;
padding: 0px;
box-sizing: border-box;
}
html {
font-size: 10px;
}
body {
height: 100vh;
overflow-x: hidden;
}
.container {
max-width: 1400px;
margin: 0 auto;
}
header {
padding-left: 40px;
padding-right: 40px;
}
nav {
display: flex;
flex-direction: row;
justify-content: space-between;
align-items: center;
min-height: 80px;
}
.nav-menuList {
display: inline-flex;
justify-content: space-between;
align-items: center;
gap: 4rem;
}
.nav-list {
list-style-type: none;
font-family: sans-serif;
font-size: 1.4rem;
font-weight: 500;
line-height: 4.4rem;
color: #000;
}
.grid-container {
display: grid;
grid-template-rows: 1fr 1fr;
row-gap: 4rem;
grid-template-areas:
"h1"
"h-btn";
padding: 0 40px;
align-self: center;
}
h1 {
font-family: sans-serif;
font-size: 4.8rem;
font-weight: 300;
line-height: 6.4rem;
color: #000;
grid-area: h1;
width: 75%;
}
.button-group {
grid-area: h-btn;
}
footer {
padding: 0 40px;
}
<body>
<div class="container">
<header>
<nav>
<div class="logo">
<svg width="32" height="32" viewBox="0 0 32 32" fill="none" xmlns="http://www.w3.org/2000/svg">
<path d="M0 4C0 1.79086 1.79086 0 4 0H28C30.2091 0 32 1.79086 32 4V28C32 30.2091 30.2091 32 28 32H4C1.79086 32 0 30.2091 0 28V4Z" fill="black" />
</svg>
</div>
<div class="menu">
<ul class="nav-menuList">
<li class="nav-list">menu</li>
<li class="nav-list">menu</li>
<li class="nav-list">menu</li>
</ul>
</div>
</nav>
</header>
<main>
<div class="grid-container">
<h1>Lorem ipsum dolor sit amet</h1>
<div class="button-group">
<button class="primary-btn hero-btn">CTA</button>
</div>
</div>
</main>
<footer>This is footer</footer>
</div>
</body>
Flexbox solution:
body or the flexbox container: min-height: 100vh;.header: height: 80px; and to the footer: height: 50px;.main or content-box consume the remaining space by adding: flex-grow: 1;body {
display: flex;
flex-direction: column;
height: 100vh;
}
header {
height: 80px;
}
footer {
height: 50px;
}
main {
flex-grow: 1;
}
/* for demonstration purpose only */
body {
margin: 0;
}
header,
footer,
main {
display: flex;
justify-content: center;
align-items: center;
}
header {
background-color: pink;
}
main {
background-color: lightblue;
}
footer {
background-color: lightgreen;
}
<header>Header</header>
<main>Content</main>
<footer>Footer</footer>
CSS-Grid solution:
body or the grid-container: min-height: 100vh;grid-template-rows: 80px auto 50px; which means that auto will consume all remaining space.body {
height: 100vh;
display: grid;
grid-template-rows: 80px auto 50px;
}
/* for demonstration purpose only */
body {
margin: 0;
}
header,
footer,
main {
display: flex;
justify-content: center;
align-items: center;
}
header {
background-color: pink;
}
main {
background-color: lightblue;
}
footer {
background-color: lightgreen;
}
<header>Header</header>
<main>Content</main>
<footer>Footer</footer>
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