style.css

body {
    background-color: grey;
}

#container {
 display: flex;
 justify-content: center;
 flex-wrap: wrap;
 height: 50vh;   
 background-color: grey;
}
img {
    width: 200px;
    height: 200px;
}
.finish-animation {
    display: flex;
    margin: 0 auto;
    height: 100vh;
    width: 100vh;
} 
.well-done {
    display: flex;
    justify-content: center;
}

@media only screen and (max-width: 600px) {
    body {
      background-color: lightblue;
    }
    #container {
        display: flex;
        justify-content: center;
        flex-wrap: wrap;
        width: 95vh;
        background-color: grey;
       }
       img {
           width: 45%;
           height: 32%;
       }
       .finish-animation {
           display: flex;
           margin: 0 auto;
           height: 100vh;
           width: 100vh;
       } 
       .well-done {
           display: flex;
           justify-content: center;
       }
       
  }