*{
    margin: 0;
    padding: 0;
}
body{
    font-family: "Segoe UI", "Lucida Grande", Helvetica, Arial, "Microsoft YaHei", FreeSans, Arimo, "Droid Sans","wenquanyi micro hei","Hiragino Sans GB", "Hiragino Sans GB W3", Arial, sans-serif;
}

h1, h2, h3, h4, h5, h6 {
    color: rgba(0,0,0,0.85);
    font-weight: 500;
}

p{
    margin: 0.5em 0 1em 0;
}

.title{
    margin-bottom: 50px;
}
.title strong{
    font-size: 2em;
    font-weight: 500;
}
.title small{
    margin-left: 10px;
    font-size: 1em;
}

/* 文档 样式 */
.doc{
    padding: 64px;
    padding-right: 170px;
    overflow: auto;
}

.doc h2{
    font-weight: 600;
}

.doc h1,.doc h2
{
    margin: 1em 0;
}

.doc h3{
    margin: 2em 0 1em 0;
}

.doc h4{
    margin: 0.5em 0;
    font-size: 1.1em;
}

.doc>h2:before, .doc>h3:before{
    color: #888;
    font-weight: 400;
}

.doc>h2 {
    counter-increment: header2;
    counter-reset: header3;
    counter-reset: header4;
}

.doc>h3{
    counter-increment: header3;
}

.doc>h4{
    counter-increment: header4;
}

.doc>h2:before {
    content: counter(header2) ". ";
}

.doc>h3:before {
    content: counter(header2) "." counter(header3) " ";
}

.doc ul{
    list-style: disc inside;
    margin-left: 10px;
}

.doc strong{
    margin: 0 2px;
}

.doc pre{
    display: block;
    padding: 10px;
    margin: 20px 5px;
    font-size: 1em;
    line-height: 1.6;
    word-break: break-all;
    word-wrap: break-word;
    color: rgb(0, 0, 0);
    background-color: #f5f5f5;
    border: 1px solid #dedede;

    font-family: Monaco,Menlo,Consolas,"Courier New",FontAwesome,monospace;
}
.card{
    margin: 10px;
    padding: 20px;
    border: 1px #888 solid;
    border-radius: 3px;
}
.card .card-header{
    font-size: 1.2em;
    text-align: center;
    margin-bottom: 15px;
}
.hr{
    width: 80%;
    margin:10px auto;
    height: 0px;
    border-top: 1px black solid;
}