table {
    border-collapse: collapse;
    margin-left: auto;
    margin-right: auto;
}

table, th, td {
    border: 1px solid black;
    padding: 4px;
}

img {
    display: block;
    margin-left: auto;
    margin-right: auto;
}

h2, h3 {
    margin-left: 40px;
}

.text_emphasis {
    font-style: italic;
    font-size: 150%;
    text-align: left;
}

.text_center {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

.story {
    display: block;
    font-size: 125%;
    text-align: left;
    margin-left: auto;
    margin-right: auto;
    width: 600px;
}

.caption {
    display: block;
    font-style: italic;
    font-size: 100%;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
    width: 400px;
}

.aside {
   display: block;
   font-size: 75%;
   text-align: left;
   margin-left: auto;
   margin-right: auto;
   width: 400px;
   border: 1px solid black;
   padding: 3px;
}

.block_center {
   display: block;
   margin-left: auto;
   margin-right: auto;
   width: 600px;
}

.block_center_no_width {
   display: block;
   margin-left: auto;
   margin-right: auto;
}