Using CSS, how do I properly align and maintain layout of HTML elements on resize? - html

Question

In the following HTML/CSS snippet, I'm trying to align the output div below the input field in such a way that they have the same width whenever the window is resized.
Right now the elements get misaligned whenever the viewport dimensions are changed.
How do i refactor and improve my CSS to achieve the desired result?.
I am still very fairly new to web design and development in general and would appreciate it if i could get detailed answers and suggestions. Thanks.
CSS/HTML
html {
font-size: 62.5%;
}
body {
background-color: #c0c0c0;
font-size: 1.6rem;
}
.section {
position: relative;
margin-top: 2rem;
text-align: center;
}
header {
margin-bottom: -2rem;
}
.text-field {
display: inline-block;
background-color: #c0c0c2;
border-top: .4rem solid;
border-color: red;
border-radius: .3rem;
color: black;
width: 50%;
height: 4.2rem;
text-align: left;
text-decoration: none;
font-size: 1.5rem;
min-width: 17.5rem;
}
.btn {
display: inline-block;
background-color: blue;
border-color: black;
border-radius: 3px;
border-style: dotted;
color: white;
padding: 14px 20px;
text-align: center;
text-decoration: none;
font-size: 16px;
}
.output-div {
position: absolute;
display: block;
font-size: 1.4rem;
background-color: #fff;
border-top: .5rem solid;
border-right: .15rem solid;
border-bottom: .15rem solid;
border-left: .15rem solid;
border-color: clack;
border-radius: .3rem;
margin: .5rem auto auto 6.5rem;
min-width: 17.4rem;
padding: .1em;
width: 50%;
height: auto;
text-align: left;
overflow-wrap: break-word;
word-wrap: break-word;
}
<br>
<!-- ✓ Oguntoye -->
<section class="section">
<header>
<h1>Header</h1>
</header>
<div class="user-interaction-area">
<form id="form">
<input class="text-field" type="text" placeholder="Input">
<button class="btn" type="button">Run</button>
</form>
</div>
<!-- output block-->
<div class="output-div">
<kbd class="input-output">Oy</kbd>
<samp class="run-output">vey!</samp>
</div>
</section>

Answer 1

I put your example code inside a codepen. https://codepen.io/melvinhicklin/pen/qyRwXB?editors=1100
From what I could see, the text areas already do a good job of staying the same width.
To align them, I added the following to the .output-div CSS Class:
position:relative;
left:-71px;
display:inline-block;