body {
    background: rgb(3,41,80);
    font: normal 100% Verdana;
    margin: 0;
    color: #555;
    text-align: justify;
}

body > * {
    width: 1000px;
    padding: 20px;
    margin: 20px auto;
    background: white;
    text-align: justify;
}

table{
    border-collapse: separate; 
    border-spacing: 5px 5px;  /* 水平间距 垂直间距 */
}

a {
    color: #28D;
    text-decoration: none;
    height: 50%;
}

cite {
 font: normal 80% sans-serif;
}


h1 {
    margin: 0;
}
h2 {
    font-size: 150%;
    margin: 0;
}
h3, h4, h5, h6 {
    margin: 0;
    font-size: 120%;
}


a strong {
  color: inherit;
  font-weight: 900;
}

strong {
  font-weight: 700;
  color: #151515;
}

em {
  font-weight: 100;
}

ul {
    list-style-type: square;
    padding: 0 1em;
}

li {
    padding:  5px;
}

td { padding: 0px 5px 0px 0px; }

code, pre, tt {
    font: 12pt monospace;
}

pre {
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 0.5em;
}


header {
    position: relative;
}

header nav {
    font-size: 110%;
    position: absolute;
    right: 0;
    top: 20px;
}

header nav ul {
    padding: 0;
    margin: 0;
}

header nav li {
    display: inline-block;
    margin: 0 0.15em;
    vertical-align: middle;
}