.emoticon{
    background-position: 50% 50%;
    background-repeat: no-repeat;
    background-size: contain;
    height: 21px;
    min-height: 1em;
    min-width: 1em;
    width: 21px;
    display: inline-block;
}      

.post-code{
    position: relative;
    overflow-x: auto;
}

.post-code code{
    border: 1px solid #ddd;
    border-radius: .25em;
    display: block;
    font-size: 13px;
    margin: 5px 0;
    overflow-x: auto;
    padding: 6.5px;
    text-align: left;
    white-space: pre;
}

.post-code__language, .post-code__lineno {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    -o-user-select: none;
    user-select: none;
}
.post-code__language {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
    opacity: 0;
    -webkit-transition: opacity,.6s;
    -moz-transition: opacity,.6s;
    -o-transition: opacity,.6s;
    transition: opacity,.6s;
    background: #21586d;
    border-radius: 0 0 0 2px;
    color: #fff;
    padding: 4px 10px 5px;
    position: absolute;
    right: 0;
    top: 5px;
    z-index: 5;
}

@media screen and (max-width: 768px){
    .post-code:hover .post-code__language, .post-code__language {
        filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=60);
        opacity: .6;
    }
    .post-code__language {
        -webkit-transition: none;
        -moz-transition: none;
        -o-transition: none;
        transition: none;
        display: block;
        position: relative;
    }
}

.post-code:hover .post-code__language {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
    opacity: 1;
}