Have a look here →
Tags in Editing view (source and live preview) have three parts: The main section for background, text color, etc., and then the beginning & end for paddings and borders.
For example, here Reading and Editing view tags are separated:
/*---- reading view tag ----*/
.tag[href="#Google"] {
background: #fff;
color: #176bef;
border: 2px solid #176bef;
line-height: 2em;
font-weight: 500;
padding-top: 1.5px;
padding-bottom: 3px;
}
/*---- source + live preview tag ----*/
.markdown-source-view .cm-tag-Google {
background: #fff;
color: #176bef;
border-top: 2px solid;
border-bottom: 2px solid;
line-height: 2em;
font-weight: 500;
}
.markdown-source-view .cm-hashtag-begin.cm-tag-Google {
border-left: 2px solid;
padding-top: 1px;
padding-right: 1px;
padding-bottom: 3.5px;
}
.markdown-source-view .cm-hashtag-end.cm-tag-Google {
border-right: 2px solid;
padding-top: 1px;
padding-bottom: 3.5px;
}
