html {
    margin: 0px;
    padding: 0px;
}
body {
    font-family: 'SimSun','MS Gothic','Courier New', Courier, monospace;
    background-color: rgb(11, 13, 38);
    color: white;
}
nav {
    background-color: black;
    width: 90%;
    margin-left:auto;
    margin-right:auto;
}

nav>ul {
    list-style-type: none;
    display: flex;
    flex-flow: row wrap;
    margin-top: 0;
    margin-bottom: 0;
}

.headlink {
    color: white;
    font-size: 1.2em;
}

.headlink:link {
    color: red;
    text-decoration: none;
}

.headlink:visited {
    color: white;
    text-decoration: none;
}

.headlink:hover {
    color: yellow;
    text-decoration: underline;
}

header {
    border-bottom-style: solid;
    border-bottom-width: 1px;
    width: 75%;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

#postbody {
    width: 60%;
    margin-left: auto;
    margin-right: auto;
}

.postwrapper {
    border-left-width: 1px;
    border-left-style: solid;
    padding-left: 30px;
    border-right-width: 1px;
    border-right-style: solid;
    padding-right: 30px;
    margin-top: 10px;
    margin-bottom: 10px;
}

/* ===== small screen adjustments ===== */
 @media screen and (max-width: 768px) {
    #postbody {
        width: 90%;
    }
}