In 2024, the top 15 CSS trends to watch for include CSS Grid, CSS Writing Mode, Scroll Snap Behavior, Container Queries, new color palettes (HWB, LAB, and LCH), CSS Variables, Viewport Units, Cascade Layers, Content Visibility, Gap, Object View Box, Inset, Variable Fonts, Text Overflow, and Comparison Functions. These trends will help developers create visually stunning responsive designs by leveraging the power of CSS.