How to get rid of border and padding of av_textblock_section

How can I get rid of border and padding of av_textblock_section –>

 section:

CSS changing here show results in Firebug but does not work with Quick CSS:
pre {
    clear: both;
    border-style: solid; (change to none)
    border-width: 1px; (change to none)
    overflow: auto;
    padding: 2em; (change to none)
    line-height: 2em;
    font-size: 12px;
    background-image: -webkit-linear-gradient(rgba(0,0,0,.05) 50%,transparent 50%,transparent);
    background-image: -moz-linear-gradient(rgba(0,0,0,.05) 50%,transparent 50%,transparent);
    background-image: linear-gradient(rgba(0,0,0,.05) 50%,transparent 50%,transparent);
    background-size: 100% 4em;
    font-family: Monaco,"Andale Mono","Courier New",Courier,monospace;
    -webkit-transition: all ease-in-out 0.5s;
    -moz-transition: all ease-in-out 0.5s;
    transition: all ease-in-out 0.5s;
    margin-bottom: 30px;
    position: relative;
    left: 0;
    text-transform: none;
    width: 100%;
}