width: 720px;

This section has a fixed width of 720px. It won't adapt to different screen sizes and may cause horizontal scrolling on smaller devices. This section has a fixed width of 720px. It won't adapt to different screen sizes and may cause horizontal scrolling on smaller devices. This section has a fixed width of 720px. It won't adapt to different screen sizes and may cause horizontal scrolling on smaller devices.

width: 60%; max-width: 72ch;

This section uses 60% width but won't exceed 72 characters wide, making it readable on larger screens while still being responsive. This section uses 60% width but won't exceed 72 characters wide, making it readable on larger screens while still being responsive. This section uses 60% width but won't exceed 72 characters wide, making it readable on larger screens while still being responsive.

width: 60%; min-width: 32ch;

This section uses 60% width but maintains a minimum of 32 characters wide to ensure readability even on very narrow screens. This section uses 60% width but maintains a minimum of 32 characters wide to ensure readability even on very narrow screens. This section uses 60% width but maintains a minimum of 32 characters wide to ensure readability even on very narrow screens. This section uses 60% width but maintains a minimum of 32 characters wide to ensure readability even on very narrow screens.

width: min(72ch, 50%);

This section takes the smaller value between 72 characters and 50% of the viewport width, ensuring optimal reading length. This section takes the smaller value between 72 characters and 50% of the viewport width, ensuring optimal reading length. This section takes the smaller value between 72 characters and 50% of the viewport width, ensuring optimal reading length.

width: max(72ch, 50%);

This section takes the larger value between 72 characters and 50% of the viewport width, maintaining a minimum size while allowing growth.

width: clamp(30ch, 60%, 72ch);

This section uses clamp to set a flexible width between 30 and 72 characters, with a preferred value of 60% of the viewport width.