trying to center .follow-btn using justify-content:center; [duplicate] - css

Question

This question already has answers here:
In CSS Flexbox, why are there no "justify-items" and "justify-self" properties?
(6 answers)
Closed 2 years ago.
<style>
body {
font-family: Arial, sans-serif;
}
header, footer {
display: flex;
flex-direction: row;
}
header .profile-thumbnail {
width: 50px;
height: 50px;
border-radius: 4px;
}
header .profile-name {
display: flex;
flex-direction: column;
justify-content: center;
margin-left: 10px;
}
header .follow-btn {
display: flex;
justify-content:center;
margin: 0 0 0 auto;
}
header .follow-btn button {
border: 0;
border-radius: 3px;
padding: 5px;
}
header h3, header h4 {
display: flex;
margin: 0;
}
#inner p {
margin-bottom: 10px;
font-size: 20px;
}
#inner hr {
margin: 20px 0;
border-style: solid;
opacity: 0.1;
}
footer .stats {
display: flex;
font-size: 15px;
}
footer .stats strong {
font-size: 18px;
}
footer .stats .likes {
margin-left: 10px;
}
footer .cta {
margin-left: auto;
}
footer .cta button {
border: 0;
background: transparent;
}
</style>
<header>
<img src="https://freecodecamp.s3.amazonaws.com/quincy-twitter-photo.jpg" alt="Quincy Larson's profile picture" class="profile-thumbnail">
<div class="profile-name">
<h3>Quincy Larson</h3>
<h4>#ossia</h4>
</div>
<div class="follow-btn">
<button>Follow</button>
</div>
</header>
<div id="inner">
<p>I meet so many people who are in search of that one trick that will help them work smart. Even if you work smart, you still have to work hard.</p>
<span class="date">1:32 PM - 12 Jan 2018</span>
<hr>
</div>
<footer>
<div class="stats">
<div class="Retweets">
<strong>107</strong> Retweets
</div>
<div class="likes">
<strong>431</strong> Likes
</div>
</div>
<div class="cta">
<button class="share-btn">Share</button>
<button class="retweet-btn">Retweet</button>
<button class="like-btn">Like</button>
</div>
</footer>
So my question is, before I add Justify-content:center; to header .follow-btn, the button remains ont he left, if I add any justify type of data to this it goes to the right. Wether I use center or whatever. My question is Why?. I'm trying to learn the basics and this is a bit confusing considering I just finished the course stating that justify content center should push it to the middle of the x axis, but isn't.

Answer 1

You are having: margin: 0 0 0 auto; into header .follow-btn that will align your button to the right because it will add a full margin to the left no matter what as your header is set with display:flex;.
Make margin like: margin: auto 0; if you want to align it horizontaly.
<style>
body {
font-family: Arial, sans-serif;
}
header, footer {
display: flex;
flex-direction: row;
}
header .profile-thumbnail {
width: 50px;
height: 50px;
border-radius: 4px;
}
header .profile-name {
display: flex;
flex-direction: column;
justify-content: center;
margin-left: 10px;
}
header .follow-btn {
display: flex;
justify-content:center;
margin: auto 0;
padding-left: 10px;
}
header .follow-btn button {
border: 0;
border-radius: 3px;
padding: 5px;
}
header h3, header h4 {
display: flex;
margin: 0;
}
#inner p {
margin-bottom: 10px;
font-size: 20px;
}
#inner hr {
margin: 20px 0;
border-style: solid;
opacity: 0.1;
}
footer .stats {
display: flex;
font-size: 15px;
}
footer .stats strong {
font-size: 18px;
}
footer .stats .likes {
margin-left: 10px;
}
footer .cta {
margin-left: auto;
}
footer .cta button {
border: 0;
background: transparent;
}
</style>
<header>
<img src="https://freecodecamp.s3.amazonaws.com/quincy-twitter-photo.jpg" alt="Quincy Larson's profile picture" class="profile-thumbnail">
<div class="profile-name">
<h3>Quincy Larson</h3>
<h4>#ossia</h4>
</div>
<div class="follow-btn">
<button>Follow</button>
</div>
</header>
<div id="inner">
<p>I meet so many people who are in search of that one trick that will help them work smart. Even if you work smart, you still have to work hard.</p>
<span class="date">1:32 PM - 12 Jan 2018</span>
<hr>
</div>
<footer>
<div class="stats">
<div class="Retweets">
<strong>107</strong> Retweets
</div>
<div class="likes">
<strong>431</strong> Likes
</div>
</div>
<div class="cta">
<button class="share-btn">Share</button>
<button class="retweet-btn">Retweet</button>
<button class="like-btn">Like</button>
</div>
</footer>