Note: After saving, you may have to bypass your browser's cache to see the changes.

/*
Place user custom css below
 */
div.mw-geshi {
        font-family: courier new !important;
        padding: 1em; 
        margin: 1em 0;
        overflow-x: auto;
        overflow-y: auto;
        font-size:.95em; 
        border: 1px dashed #2f6fab;
        background-color: #f9f9f9;
}
pre { 
        font-family: courier new !important;
        overflow-x: auto;
        overflow-y: auto;
        font-size:.95em;
        background-color:#EEEEEE;
}
source { 
        font-family: courier new !important;
        overflow-x: auto;
        overflow-y: auto;
        font-size:.95em;
        background-color:#f0f0f0;
        margin: 1em 0;
}
 
code { 
        font-family: courier new !important;
        font-size:.95em;
        background-color: #f0f0f0;
        padding: 2px;
}

Top