pre.line-numbers {
    position: relative;
    padding-left: 3.8em;
    counter-reset: linenumber
}

    pre.line-numbers > code {
        position: relative
    }

.line-numbers .line-numbers-rows {
    position: absolute;
    pointer-events: none;
    top: 0;
    font-size: 100%;
    left: -3.8em;
    width: 3em;
    letter-spacing: -1px;
    border-right: 1px solid #999;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none
}

.line-numbers-rows > span {
    pointer-events: none;
    display: block;
    counter-increment: linenumber
}

    .line-numbers-rows > span:before {
        content: counter(linenumber);
        color: #999;
        display: block;
        padding-right: .8em;
        text-align: right
    }