Bootstrap glyphicon arrow down not showing

[multichild]

@PaulOB

#accordion .btn-link {
position: relative;
padding-right: 2em;
display: block;
width: 100%;
}

    #accordion .btn-link:after {
        content: "";
        position: absolute;
        right: 14px;
        top: 0;
        bottom: 0;
        margin: auto;
        width: 14px;
        height: 14px;
        border: 3px solid #666;
        border-right: none;
        border-bottom: none;
        transform: rotate(45deg);
        transition: all .5s ease;
    }
    
    #accordion .btn-link[aria-expanded="true"]:after {
        transform: rotate(225deg);
    }

Oh Paul, that has absolutely nailed it, its perfect, thanks again