You just have to put the code in Extra.less:
CSS:
.userBanner strong {
min-width: 90px;
display: inline-block;
margin-left: 20px;
}
[class*="banner_"], .userBanner {
position: relative;
display: inline-block !important;
margin: 4px 0 5px !important;
font-size: 10px !important;
color: #fff !important;
text-shadow: #111 0 0 1px !important;
border-radius: 5px !important;
border-color: transparent !important;
margin-bottom: 0px !important;
padding: 4px 8px !important;
letter-spacing: .5px !important;
border: 0 !important;
text-transform: uppercase !important;
line-height: 15px !important;
}
.userBanner::before {
content: "\f007";
color: #fff;
line-height: 23px;
background-color: rgba(0,0,0,0.2);
position: absolute;
border-top-right-radius: 40px;
border-right: 2px solid rgba(0,0,0,0.1);
top: 0;
bottom: 0;
border-bottom-left-radius: 10px;
left: 0;
border-top-left-radius: 10px;
padding: 1px 4px 0 3px;
width: 20px;
font-family:'Font Awesome 5 Pro';
text-align: center;
}