how to fix the background size?

Question

i have to swipe my screen multiple times to get the whole background. how can i adjust the background according to my tab size?

Answer 1

background-size: cover;
background-position: center;

Answer 2

Lakshay Mittal even i used cover but still i had to swipe up-down, left-right multiple times. there is one giant image but not in according to my tab screen