Pretty hard to read the title without highlighting it. It seems like I have this issue on all dark themes but can't seem to find where to edit this in the css.
You will want to check out the following classes in global.css of your theme.
.trow_deleted, .post.deleted_post {
background: none repeat scroll 0% 0% #E8DEFF;
}
.trow_shaded {
background: none repeat scroll 0% 0% #FFDDE0;
border-width: 1px;
border-style: solid;
-moz-border-top-colors: none;
-moz-border-right-colors: none;
-moz-border-bottom-colors: none;
-moz-border-left-colors: none;
border-image: none;
border-color: #FFF #FFB8BE #FFB8BE #FFF;
}