Centre Image and Div Underlay in Bootstrap 4

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I'm attempting to centre an image and div layer inside a containing div, but so far I can't get it to move from the left of the column. I've tried a few different ways but just can't get it to move. Even the margin auto trick isn't working, which I suspect is because bootstrap 4 is a flex box now.

HTML:

#user-avatar {
    background: #ff4e00;
    border-radius: 50%;
    width: 250px;
    margin-bottom: 25px;
    position: relative;
}

#user img {
    border-radius: 50%;
    width: 250px;
    transition: .5s ease;
    backface-visibility: hidden;
}

#user-avatar:hover img {
    cursor: pointer;
    opacity: 0.3;
}

.middle {
    transition: .5s ease;
    opacity: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.middle i {
    font-size: 34px;
}

#user-avatar:hover .middle {
    opacity: 1;
    cursor: pointer;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js"></script>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" rel="stylesheet"/>
<div id="user" class="col-12">
    <div class="col-12" id="user-avatar">
        <img class="mx-auto d-block" src="assets/users/av-lg/liane.png" />
        <div class="middle">
            <i class="fas fa-camera-alt"></i>
            <p>Edit Avatar</p>
        </div>
    </div>
    <p id="username" class="text-center"><span>Howdy </span>Liane</p>
    <div id="xp-bar" class="text-left">
        <div id="xp"><p><i class="fas fa-stars"></i> XP</p></div>
    </div>
    <p id="stats" class="text-right">Level 1</p>
</div>

Add margin-left: 50% and transform: translateX(-50%) to #user-avatar. check below link. thank you

http://jsfiddle.net/x1hphsvb/10994/

Centre Image and Div Underlay in Bootstrap 4, I'm attempting to centre an image and div layer inside a containing div, but so far I can't get it to move from the left of the column. I've tried a few different ways but  Option 3 – Bootstrap Width Utility. In this example, I am using Bootstrap’s width utility class of .w-50 to make the div 50% wide all the time. Then I added a utility class of .mx-auto that sets the margin left and right to auto centering it horizontally inside the .row container.


Add Class on id="user-avatar" to mx-auto

<div class="col-12 mx-auto" id="user-avatar">
        <img class="d-block" src="assets/users/av-lg/liane.png" />
        <div class="middle">
            <i class="fas fa-camera-alt"></i>
            <p>Edit Avatar</p>
        </div>
    </div>

https://jsfiddle.net/lalji1051/v06j8orn/9/

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simply add this style - centrd now

#user-avatar {
    margin: 0 auto;
}

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