style.css

html
{
    margin: 0;
}

body
{
    margin: 0;
    background-color: #69c;
}

.content
{
    margin: 0 auto;
    padding: 10px 25px;
    width: 950px;
    background-color: #f0f8ff;
}

.center
{
    text-align: center;
}

.noMarkList
{
    list-style-type: none;
}

table,
tr,
td,
th
{
    padding: 5px;
    border: 1px solid black;
    border-collapse: collapse;
}

.codeContent
{
    background-color: #d3d3d3;
    padding: 0 10px;
    margin-right: 100px;
}

.author
{
    margin-left: 500px;
}

article.comment
{
    border: 1px solid black;
    border-radius: 15px;
    padding: 10px;
    margin: 10px;
}

article.comment:nth-child(2n)
{
    background-color: #b0c4dE;
}

article.comment:nth-child(2n+1)
{
    background-color: #87ceeb;
}

.commenter
{
    text-align: right;
    font-style: italic;
}

footer
{
    text-align: right;
    margin-top: 60px;
}