Change style of Blogger's quote

1. Edit your template then select edit HTML
2. Search keyword: 

]]></b:skin>  



3. Add or Modify blockquote:


.post blockquote {
background:$QuoteBackgroundColor url("$imgHackerQuote") left top no-repeat;
border:1px solid #ccc;
display:block;
font-family:Verdana;
font-size:10pt;
line-height:1.5em;
max-height:30000px;
overflow:auto;
padding:15px 15px 15px 31px;
}

About border style, you can reference to http://www.w3schools.com/css/css_border.asp