Centering banner image on screen resize - html

Question

I'm having an issue where a banner image (the "Review Us" text and lines) is not centering correctly when trying to adjust the screen size. Here is a before and after of what my issue is. The after image is also showing the same results on mobile screens
before
after
The HTML for that image goes as followed:
<div class="rowBanner">
<img src="images/reviewus.png" alth="review">
</div>
The only CSS in effect is on
div.rowBanner{
padding-top: 40px;
text-align:center;
}
I would like the "Review Us" text part of the image to be centered (left-to-right) regardless of screen width

Answer 1

The problem you have might be from desktop to mobile the hambuger menu shift your logo. using position absolute with transform: translate(-50%, 0%); will center your img by its own width.
.rowBanner {
position: absolute;
left: 50%;
display: block;
transform: translate(-50%, 0%);
}
Centering Percentage Width/Height Elements
REF: https://css-tricks.com/centering-percentage-widthheight-elements/
.navbar {
position: relative;
}
.rowBanner {
position: absolute;
left: 50%;
display: block;
transform: translate(-50%, 0%);
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<nav class="navbar navbar-default">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="rowBanner">
<img src="http://via.placeholder.com/100x50" alth="review">
</div>
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li class="active">Link <span class="sr-only">(current)</span></li>
<li>Link</li>
<li class="dropdown">
Dropdown <span class="caret"></span>
<ul class="dropdown-menu">
<li>Action</li>
<li>Another action</li>
<li>Something else here</li>
<li role="separator" class="divider"></li>
<li>Separated link</li>
<li role="separator" class="divider"></li>
<li>One more separated link</li>
</ul>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li>Link</li>
<li class="dropdown">
Dropdown <span class="caret"></span>
<ul class="dropdown-menu">
<li>Action</li>
<li>Another action</li>
<li>Something else here</li>
<li role="separator" class="divider"></li>
<li>Separated link</li>
</ul>
</li>
</ul>
</div>
<!-- /.navbar-collapse -->
</div>
<!-- /.container-fluid -->
</nav>

Answer 2

Just add this css to the image:
div.rowBanner > img {
display: block;
margin: 0 auto;
max-width: 100vw;
}
Edited: Added a maximum with to the img, 100vw means 100 viewport width units, See: http://caniuse.com/#feat=viewport-units

Answer 3

You may try following CSS:
div.rowBanner {
margin-left:auto;
margin-right:auto;
width:80%;
}

Answer 4

What about using CCS background-image to set your image. You can then control where the center point is on different resolutions via background-position
function resize(isDesktop) {
if (isDesktop) {
$('.banner').css('width', '100%');
} else {
$('.banner').css('width', '200px');
}
}
.banner {
background-image: url('https://i.ytimg.com/vi/qh7LLydY8eo/maxresdefault.jpg');
background-size: cover;
background-position: center;
height: 175px;
width: 100%;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button onclick="resize(true)">Desktop</button>
<button onclick="resize()">Mobile</button>
<div class="page">
<div class="banner">
</div>
</div>