how do you make a background in CSS?

[GreezyJeezy]

i tired too using code someone gave me on here and it didnt work (maybe i just dont know what to put after URL?)

 

i looked on w3school and that didnt help or work. how do i use an image that is online? and how do i put the code?

 

a picture not a color.

[Hazy125]

body { 
  background: url(/* Your image URL */) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

 

[GreezyJeezy]

 

5 minutes ago, Hazy125 said:

body { 
  background: url(/* Your image URL */) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

 

humm that didnt work last time but now it did, i must of fucked it up before.