html {
    background: #e6e9e9;
    background-image: linear-gradient(270deg, rgb(230, 233, 233) 0%, rgb(216, 221, 221) 100%);
    -webkit-font-smoothing: antialiased;
}

header {
    background: #fff;
    color: aliceblue;
}

body {
    background: #fff;
    box-shadow: 33 12 2px rgba(0, 0, 0, 0.06);
    color: #545454;
    font-family: Open Sans,Helvetica Neue,Helvetica,Arial,sans-serif;
    font-size: 14px;
    font-weight: 400;
    line-height: 1.5;
    margin: 0 auto;
    max-width: 1000px;
    padding: 1em 2em 2em;
    text-align: justify;
}

footer{
    font-size: 12px;
    color: darkgray;
    text-align: center;
}

h1, h2, h3, h4, h5, h6 {
    color: #222;
    font-weight: 600;
    line-height: 1.3;
}

h2 {
    margin-top: 1.3em;
}

table {
    border-collapse: collapse;
}

table, th, td {
    border: 1px solid #ddd;
    text-align: left
}

th {
    width: auto;
}

tr:hover {background-color: #f5f5f5}

a {
    color: #0083e8;
}

b, strong {
    font-weight: 600;
}

samp {
    display: none;
}

img {
    -webkit-animation: colorize 2s cubic-bezier(0, 0, .78, .36) 1;
            animation: colorize 2s cubic-bezier(0, 0, .78, .36) 1;
    background: transparent;
    border-radius: 1px;
    display: grid;
    margin: 1.3em auto;
    max-width: 30%;
}

ul.nav {
    list-style-type: none;
    margin: 0;
    padding: 0;
    width: 20%;
    max-width: 200px;
    background-color: #ebebeb;
    position: absolute;
    height: auto;
    overflow: auto;
    text-align: left;
    font-size: 14px;
}

li.nav-title {
    display: block;
    color: white;
    background: #555;
    padding: 8px 10px;
    text-decoration: none;
}
li.nav a {
    display: block;
    color: #000;
    padding: 8px 16px;
    text-decoration: none;
}

li.nav a.active {
    background-color: #4CAF50;
    color: white;
}

li.nav a:hover:not(.active) {
    background-color: #555;
    color: white;
}

.article{
    margin-left:23%;
    padding:1px 10px;
    max-width: 800px;
}

pre {
    /*font-family: monospace;*/
    /*background-color: #F9F9F9;*/
    /*font-size: 15px;    */
    /*padding-left: 0px;*/
    border: 1px solid #EEE
}

@-webkit-keyframes colorize {
    0% {
        -webkit-filter: grayscale(100%);
    }
    100% {
        -webkit-filter: grayscale(0%);
    }
}

@keyframes colorize {
    0% {
        filter: grayscale(100%);
    }
    100% {
        filter: grayscale(0%);
    }
}