The Original Code:

#box{ width:100px;
height:100px;
background-size:contain;
background-repeat: no-repeat;
background-image:url(
https://i.pinimg.com/originals/78/0a/a2/780aa264e6ec4
014edea4beb159eef51.gif);
position:absolute;
transition: 1s; }
#person{width:100px;
height:100px;
background-size:contain;
background-repeat: no-repeat;
background-image:url(person.svg.png);
position:absolute;
transition: 0s;}}

#box{ width:100px;
height:100px;
background-size:contain;
background-repeat: no-repeat;
background-image:url(
"theater.png"; );
position:absolute;
transition: 1s; }
#person{width:100px;
height:100px;
background-size:contain;
background-repeat: no-repeat;
background-image:url("theater.png"; );
position:absolute;
transition: 0s;}}

#box{ width:100px;
height:100px;
background-size:"theater.png";
background-repeat: no-repeat;
background-image:url(
https://i.pinimg.com/originals/78/0a/a2/780aa264e6ec4
014edea4beb159eef51.gif);
position:absolute;
transition: 1s; }
#person{width:100px;
height:100px;
background-size:contain;
background-repeat: "theater.png";
background-image:url(person.svg.png);
position:absolute;
transition: 0s;}}