Try this code in extra.less and see if it works for you.XF2.3 Compatibility?
		Code:
	
	/* Sticky Thread Container */
.structItemContainer-group--sticky {
    border-left: 4px solid var(--xf-borderColorAccent, @xf-borderColor);
    padding: 12px;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--xf-stickyBackground, @xf-contentBg) 0%, var(--xf-stickyBackgroundAlt, @xf-paletteColor1) 100%);
    box-shadow: 0 2px 8px var(--xf-shadowColor, rgba(0, 0, 0, 0.15));
    border-radius: 8px;
    transition: background-color 0.3s, box-shadow 0.3s, border-color 0.3s;
}
/* Sticky Icon */
.structItem-status--sticky::before {
    content: "\f08d"; /* Sticky Pin Icon */
    font-family: "Font Awesome 5 Free";
    font-weight: 900;
    color: var(--xf-stickyIconColor, @xf-linkColor);
    margin-right: 8px;
    font-size: 16px;
}
/* Sticky Text Color */
.structItem-status--sticky {
    color: var(--xf-stickyTextColor, @xf-textColorMuted);
}
/* Golden Separator Line */
.structItemContainer-group--sticky + .structItemContainer-group--nonsticky {
    border-top: 4px solid var(--xf-goldenSeparator, #FFD700);
    margin-top: 15px;
    padding-top: 15px;
}
/* Dark Theme Adjustments */
html[theme="dark"] .structItemContainer-group--sticky {
    background: linear-gradient(135deg, var(--xf-stickyBackgroundDark, #2b2b2b) 0%, var(--xf-stickyBackgroundAltDark, #1c1c1c) 100%);
    box-shadow: 0 2px 8px var(--xf-shadowColorDark, rgba(255, 255, 255, 0.1));
}
html[theme="dark"] .structItem-status--sticky::before {
    color: var(--xf-stickyIconColorDark, #f5f5f5);
}
html[theme="dark"] .structItem-status--sticky {
    color: var(--xf-stickyTextColorDark, #f5f5f5);
}
/* Dark Theme Golden Separator */
html[theme="dark"] .structItemContainer-group--sticky + .structItemContainer-group--nonsticky {
    border-top: 4px solid var(--xf-goldenSeparatorDark, #FFCC00);
}![[OzzModz] Advanced Sticky Thread Separator](/community/data/resource_icons/8/8542.jpg?1634774854)
 
 
		

 
 
		

