styles.css

body {
    line-height: 1.3;
    font-family: "Linux Libertine","Georgia","Times",serif;
    padding: 24px;
    margin-bottom: 200px;
}

/*********************/
/* Table of Contents */
/*********************/
.toc {
    display: table;
    border: 1px solid #a2a9b1;
    background-color: #f8f9fa;
    padding: 7px;
}

.toc h2 {
    display: inline;
    border: 0;
    padding: 0;
    font-weight: bold;
    font-size: 100%;
}

.toc a {
    text-decoration: none;
}

.toc a:hover {
    text-decoration: underline;
}

.toc a:focus {
    text-decoration: underline;
}

/*********************/
/* Links             */
/*********************/

a[id] {
    color: black;
}

a:not([id]) {
    color: #0645ad;
}

a:visited:not([id]) {
       color: #0645ad;
}

/*********************/
/* Headings          */
/*********************/
h1, h2, h3, h4, h5, h6 {
    font-weight: normal;
}

h1, h2, h3 {
    border-bottom: 1px solid #a2a9b1;
    margin-top: 21px;
}

h3 {
    margin-top: 60px;
}

h4 {
    text-decoration: underline;
    margin: 0;
}

/*********************/
/* Body text         */
/*********************/

/*p {
    margin: 0;
}*/

/*********************/
/* Screenshots       */
/*********************/

.screenshot {
    float: right;
    margin-left: 10px;
}

/*********************/
/* Tables            */
/*********************/

table{
    border-collapse:collapse;
    border:1px solid black;
}
    
table td{
    border:1px solid black;
    padding: 7px;
    vertical-align: top;
}

table th{
    border:1px solid black;
    padding: 7px;
}

tr:nth-child(even) { 
    background-color: Lightblue; 
}