body {
    font-family: 'Arial', sans-serif;line-height: 1.6;padding: 0;
    background-color: #f4f4f9;color: #333;
    width: 100%;max-width: 999px;margin: 0 auto;
    display: flex;flex-direction: column; min-height: 100vh; 
}
#my-nav {display: flex;align-items: center;}
footer,#my-nav,#edit{text-align: center;padding: 9px;margin: 9px;}
header,footer{flex: 0 0 auto;}
header{ display: flex;justify-content: space-between;align-items: center;}
footer a img{vertical-align:middle}
#toc{position: fixed;top: 15%;right: 3vw;
cursor: pointer;background: linear-gradient(45deg, #ff6b6b, #ee5a24);color: #f9f9f9;}
#as{position: absolute;top: 100%;left: 0;background: #f9f9f9;margin-top: 19px;}
#toc,#as{padding: 9px;border-radius: 5px;border: 1px solid #ddd;box-shadow: 0 9 19px rgba(0,0,0,0.2);line-height: 1.3;width:20vw;max-width: 150px;}
#as a {display: block;padding:5px;}
footer a,#as a{color: #333;}
a{text-decoration: none;}
#toc a:hover {background: #ddd;}
.hidden {display: none;}

.markdown-body {
    flex: 1 1 auto;
    box-sizing: border-box;
    min-width: 200px;
    max-width: 980px;
    margin: 0 auto;
    padding: 45px;
}

@media (max-width: 768px) {
    #toc,#toc a,footer,footer a,#my-nav,#edit{font-size: 12px;}
    .markdown-body{padding: 15px;}
}