If you use blogger great though it is, you'll know that when your in 'Compose' mode, blogger kindly reformats the page layout for you by inserting a line break at each paragraph, even if none are needed. This can throw your hard work and carefully crafted design out of sync.
To over come this flaw, switch to 'HTML' mode and manually delete the unneeded additional line breaks and save your work. You must save it in 'HTML' mode. If you switch back to 'Compose' mode and save, blogger will kindly re-instate the line breaks you just deleted.
Its the only way to stop Blogger over-riding your design-layout.