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as it is the mini call is governed by the css properties of the left column. is there a template for mincal.html? if so you could use a div tag around the .html
there is many ways to do it, but something like this would work:
template.html
you could edit your style.css included with your theme to affect the left column this is the relevant css:
td#leftcolumn {width: 200px; font-size:12px; background : #FFFFFF; }
td#leftcolumn th {background-color: #FFFFFF; color: #000000; vertical-align: middle;}
td#leftcolumn .blockTitle {padding: 8px; background-color: #FFFFFF; background-image: url(blocktitle.jpg); color: #FFFFFF; font-weight:bold; text-align: center; }
td#leftcolumn .blockContent {padding: 3px; line-height: 120%; line-height: 120%;background-color: #eee;margin-bottom:8px; background : #FFFFFF; }