/* Replace XXXXX with your page ID */
.collection-YOURID header,
.collection-YOURID footer {
display: none !important;
}
.collection-YOURID .Header,
.collection-YOURID .Footer,
.collection-YOURID .site-header,
.collection-YOURID .site-footer {
display: none !important;
}
/* Optional: remove spacing left behind */
.collection-XXXXX main,
.collection-XXXXX .Main-content {
margin: 0 !important;
padding: 0 !important;
}
