Removing space at the top left and right of div

Answer 1

If you need some padding inside the div, you should choose padding:

padding:top right bottom left;

example:

padding:5px; /* 5px padding at all sides)*/
padding:5px 3px; /* top & bottom 5px padding but right left 3px padding) */
padding:5px 3px 4px; /* top 5px, bottom 4px padding but left right 3px) */
padding:1px 2px 3px 4px; /* top 1px, right 2px bottom 3px & left 4px) */

Similarly to control the space outside the div, you can use margin.

Margin will use exact same formula.