Bug#612840:

[Leo Iannacone <l3on@ubuntu.com>]

Removing this in debwiki.css:
############################################
td.diff-added {
  color: #31a300;
}
td.diff-removed {
  color: #c70036;
}
td.diff-info {
  padding-left:0;
}
#############################################

And adding this fixes this problem:

#############################################
/* diffs from classic */
.diff {
    table-layout: fixed;
}
.diff-header {
    font-weight: bold;
}
.diff-title {
    background-color: #C0C0C0;
}
.diff-added {
    background-color: #E0FFE0;
    font-family: courier,monospace;
    vertical-align: top;
    white-space: pre-wrap;
    width: 50%;
    word-wrap: break-word;
}
.diff-removed {
    background-color: #FFFFE0;
    font-family: courier,monospace;
    vertical-align: top;
    white-space: pre-wrap;
    width: 50%;
    word-wrap: break-word;
}
.diff-added span {
    background-color: #80FF80;
}
.diff-removed span {
    background-color: #FFFF80;
}
td.diff-info {
    vertical-align: top;
}
div.diff-info {
    white-space: nowrap;
}
div.diff-info-rev-comment span.diff-info-value {
    white-space: normal;
}
div.diff-info-header {
    background-color: #E8E8E8;
    margin: -0.25em -0.5em 0.25em;
    padding: 0.25em 0.5em;
    text-align: center;
    width: 100%;
}
td.diff-same {
    border: 0 none;
    text-align: center;
}
#############################################


Here a preview:
http://i.imgur.com/Gm4n5Um.png

I did not find where theme is hosted in alioth (it does not appear to
be in the wiki.debian.org repository) or I would patched it by myself.


L.


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