在theme.scss.liquid末尾空白处
.Header__MainNav .HorizontalList>li:nth-of-type(10)>a{color:red;font-weight:bold;position:relative}

.chicv-relative{
position:relative;
}

.hotTag::after {
position: absolute;
top: 95%;
left: 5px;
content: '';
width: 0;
height: 0;
border-style: solid;
border-width: 5px 4px 0 4px;
border-color: #f35b6e transparent transparent transparent;
}
.hotTag {
position: absolute;
padding: 0 6px .5px;
left: 0px;
top: -15px;
color: #fff;
background-color: #f35b6e;
line-height: 15px;
height: 15px;
font-size: 10px;
white-space: nowrap;

}

在header.liquid搜{{- link.title | escape -}},大概在237行左右。
{%- if forloop.index==2 or forloop.index==11 -%}
<span class="hotTag">hot</span>
{%- endif -%}