qTox/themes/default/msgEdit/msgEdit.css

QTextEdit
{
    border-color: @groundExtra;
    border-style: solid;
    border-width: 1px 0 1px 1px;
    background: white;
}

QTextEdit:hover
{
    border-color: #d7d4d1;
}

QTextEdit:pressed
{
    border-color: #4ea6ea;
}

QTextEdit#group
{
    /*border-radius: 0 6px 6px 0; would use to round corners in groupchat, but Qt's implementation seems to be bugged*/
    border: 1px solid #c4c1bd;
}

QTextEdit#group:hover
{
    border-color: #d7d4d1;
}

QTextEdit#group:pressed
{
    border-color: #4ea6ea;
}