1blue=document.getElementsByClassName("check1")[0]
2red=document.getElementsByClassName("check2")[0]
3yellow = document.getElementsByClassName("check3")[0]
4function colors(color) {
5    document.body.style.backgroundColor = color;
6}
7 blue.addEventListener("click", e => {
8     if (blue.checked) {
9         colors("blue")
10     }
11     else if (red.checked) {
12         colors("red")
13     }
14     else if (yellow.checked) {
15         colors("yellow")
16         }
17     else {
18    colors("white")         
19     }
20 })
21
22red.addEventListener("click", e => {
23    if (red.checked) {
24       colors("red")
25    }
26    else if (blue.checked) {
27        colors("blue")
28    }
29    else if (yellow.checked) {
30        colors("yellow")
31    }
32    else {
33     colors("white")
34    }
35})
36yellow.addEventListener("click", e => {
37    if (yellow.checked) {
38     colors("yellow")
39    }
40    else if (red.checked) {
41        colors("red")
42    }
43    else if(blue.checked){
44      colors("blue")
45    }
46    else {
47       colors("white")
48    }
49})
50