Removing space at the top left and right of div

Answer 1

margin: 0px; would remove all spaces around the element.

padding: 0px; clears the area around the content

you can try:

html, body {margin: 0px; padding:0px;}
body {margin: auto;}

with margin:auto; the browser calculates a margin.

You can also use

* {margin: 0px; padding: 0px;}

this will remove all default margins and spaces. But be careful while using:

position: absolute; 

The 'position' property can take 4 values, static, relative, fixed and absolute. Then you can use top, bottom, left, right properties to position your element. This depends on your layout. This link might be useful https://www.w3schools.com/css/css_margin.asp