A tiny modern CSS reset that covers the basics:

• resets the font sizes: so that using semantic markup doesn't affect the styling
• resets the block margins: so that the spacing is only applied when you need it
• resets tables: so that tabular data only takes the space it needs
• preserves the inline paddings: so that buttons and inputs keep their default layout
• sets the border-box box sizing: so that borders and paddings don't affect the set dimensions
• sets responsive media elements: so that images and embeds scale with the browser width