div#footer_wxapp {position: fixed;bottom: 0;background: #fff;width: 100%;box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);z-index: 1001;}
div#footer_wxapp li{
    display: inline-block;
    flex: 1;
    text-align: center;
}

div#footer_wxapp ul {
    display: flex;
    flex-direction: row;}

div#footer_wxapp li a {
    line-height: 1.5em;
    padding:1em 0;
    font-size: 12px;
    display: block;
}
div#footer_wxapp li  a:before {
  
    display: block;
    font-style: normal;
    font-variant: normal;
    text-rendering: auto;
    
    font-weight: 900;
    font-size: 16px;
    font-family:FontAwesome,"Font Awesome 5 Free";
}
div#footer_wxapp li:first-child a:before {
    content: "\f015";      
}
div#footer_wxapp li:nth-child(2) a:before {
     content: "\f0c9"; 
}
div#footer_wxapp li:nth-child(3) a:before {
     content:"\f0c5"; 
}
div#footer_wxapp li:nth-child(4) a:before {
     content: "\f041"; 
}