Center both elements like "display: none;" - html

Question

.Button_Image {
width: 40px;
-webkit-transition: opacity 0.5s linear;
-moz-transition: opacity 0.5s linear;
-ms-transition: opacity 0.5s linear;
-o-transition: opacity 0.5s linear;
opacity: 1;
}
.Button:hover .Button_Image {
opacity: 0;
}
.Button_Name {
font-size: 18px;
color: black;
line-height: 40px;
-webkit-transition: opacity 0.5s linear;
-moz-transition: opacity 0.5s linear;
-ms-transition: opacity 0.5s linear;
-o-transition: opacity 0.5s linear;
opacity: 0;
}
.Button:hover .Button_Name {
opacity: 1;
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<a href="#" class="Button btn btn-success btn-block">
<img class="Button_Image" src="https://i.stack.imgur.com/hiAkR.png">
<span class="Button_Name">Football</span>
</a>
I have a button which has 2 elements inside.
Image of a sport
Name of the sport
When either of these have the css value display: none; the visible one is aligned to center perfectly.
But I needed to add a fade-in-out functionality, so I wasn't able to use display keyword. Instead I went for opacity.
Which resulted these 2 elements to stay side by side even if one is hidden.
How can I center these, when the other one is hidden?
This image has been captured during the transmission event:
The current state is like this:
But I need it like this:

Answer 1

You can achieve what you want with absolute positioning of the image. Is something like this what you want?:
.sportbtn {
border: green 1px solid;
width: 150px;
height: 40px;
position: relative;
line-height: 40px;
}
.sportimg {
/* centered in button */
width: 30px;
transition: left 1s, margin-left 1s;
position: absolute;
left: 50%;
margin-left: -15px; /* half the image width */
margin-top: 5px;
}
.sportname {
transition: opacity 1s;
opacity: 0;
margin-left: 40px;
}
.sportbtn:hover .sportname {
opacity: 1;
}
.sportbtn:hover .sportimg {
margin-left: 0px;
left: 5px;
}
<div class="sportbtn">
<img class="sportimg" src="https://d30y9cdsu7xlg0.cloudfront.net/png/23344-200.png" />
<span class="sportname">Football</span>
</div>