space between divs

Question

By default, there is a space between divs
How to close this gap?

Answer 1

This is because of default padding and margin, so you can select div and set margin and padding to 0, or value you need.

Most developer do "resets" by selecting all elements, or root or elements thay need..
* {
margin: 0;
padding: 0;
}

This is more about resets, with some example http://web.simmons.edu/~grovesd/comm244/notes/week4/css-reset

Answer 2

Open the developer panel in a browser and see what exactly indents. After this change css file (margin or padding)