Here is the styleplus. css file from skn6-guppy-03 for GuppY 6,
it is deliberately reduced to the bare necessities.

 

/*  ---------  CSS generated for skin6-guppy-03 ----------- */

body { letter-spacing: 0.1em !important; } /* letter gap increase */
.T0entrow0 { padding: 10px;background-color: #0F056B;} /* internal margins and color line 0 */
.T0entrow3 { padding: 10px 25px;} /* internal margins line 3 */
.T0entrow6 { display: none; } /* not display */
div.quote span.labelcita { display: none; } /* not display */
#MainContent { margin: 50px auto; } /* external margins */
.navbar.ddl .dropdown-menu > div, .navbar.ddl .dropdown-menu > div p { font-size: 1.8rem; } /* font size */
.tbl.DDL69 { background-color: transparent; } /* background color */
.navbar.ddl.DDL69 { max-width: 760px;margin: auto; } /* maximum width and external margins */
.navbar.ddh.DDH74 { max-width: 640px;margin: auto; } /* maximum width and external margins */
.tbl.DDH74 { background-color: transparent; } /* background color */
.DDH74 ul.dropdown-menu { width: 262px; } /* width */
.nav-item.dropdown.DDH74 { margin: 0 !important; } /* external margins */
.tbl.DDV90 { background-color: transparent; } /* background color */
.navbar.ddv { background-color: #A9EAFE !important;padding:1.5rem 0 !important; } /* background color and internal margins */
.dropdown-menu { color: #FFF !important; background-color: #CCFFFF !important;padding: 5px !important; } /* background color and internal margins */
.titrebox, .titre {font-variant: small-caps; } /* small caps for titles */
.bord2 { border: 0; } /* no border */
.lisubrubr { line-height: 3rem;background-color: #CCFFFF !important; } /* line height and background color */
@media screen and (min-width: 768px) and (max-width: 1080px){
 .B0entrow2 .col-md-3 { -ms-flex: 0 0 50%; flex: 0 0 50%; max-width: 100%; }
} /* passage in 2 columns with bottom line 2 between 768px and 1080px */
.B0entrow1  { padding: 20px 40px !important; } /* internal margins bottom line 1 */
#BottomBoxes .titre, #BottomBoxes .tbl, #BottomBoxes .titrebox, 
#BottomBoxes .tblbox { padding: 20px 40px !important; } /* internal margins bottom boxes */