XF 1.5 FB Login Integration

We've just had out site updated to 1.5, yaaaaay. Have been working on the Facebook integration, however noticed that the bar looks off.

See image below for what I mean. I need to get it centralised, without having that dark blue gap on the bar itself.....Help, thanks.

The CSS code is also attached below the image

Screen Shot 2017-08-30 at 10.07.10.png

#loginBar a.fbLogin
display: inline-block;
width: @eAuthButtonWidth;
height: 22px;
box-sizing: border-box;
cursor: pointer;

background: #29447e url('@imagePath/xenforo/connect_sprite.png');
background-repeat: no-repeat;
border-radius: 3px;
rtl-raw.background-position: {xen:if $pageIsRtl, 'right -396px', 'left -188px'};
padding: 0px 0px 0px 1px;
outline: none;

text-decoration: none;
color: white;
font-weight: bold;
font-size: 11px;
line-height: 14px;
#loginBar a.fbLogin:active
rtl-raw.background-position: {xen:if $pageIsRtl, 'right -418px', 'left -210px'};
#loginBar a.fbLogin:hover
text-decoration: none;
a.fbLogin span
background: #5f78ab url('@imagePath/xenforo/connect_sprite.png');
border-top: solid 1px #879ac0;
border-bottom: solid 1px #1a356e;
display: block;
padding: 2px 4px 3px;
margin: 1px 1px 0px 21px;
text-shadow: none;
white-space: nowrap;
overflow: hidden;
a.fbLogin:active span
border-bottom: solid 1px #29447e;
border-top: solid 1px #45619d;
background: #4f6aa3;
text-shadow: none;