javascript - Page background doesn't display whole image -

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i have website background image, choosen random javascript:

document.body.style.background= 'url('+randombgs[num]+')';

i have set background imagefrom randombgs[] array contains 15 backgrounds. background gets cut off, , whole image isn't displayed (see picture below)

this see:
this see

this should see
this should see

how can fix this, browser shows whole image , not 95% of it?

use css background-size property: 

body {   background-size: contain; }

the image fit container.


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