ttom: 1em;
    }
    .demo ul li .num {
        color: #222;
        border-radius: 20px;
        display: inline-block;
        width: 26px;
        padding: 3px;
        height: 26px;
        text-align: center;
        margin-right: 0.5em;
        border: 1px solid #222;
    }
    .demo ul li code {
        background-color: #222;
        border-radius: 4px;
        padding: 0.25em 0.5em;
        display: inline-block;
        color: #fff;
        font-family: Consolas,Monaco,Lucida Console,Liberation Mo