* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: lightslategray;
}

#mouse {
    width: 500px;
    transition: all 0.5s ease-in-out;
    position: relative;
    z-index: 1;
}

#cheese {
    width: 200px;
    transition: all 0.5 ease-in;
}
.move-right {
    transform: translate(400px);
}

#overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.75);
    color: white;
    font-size: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    visibility: hidden;
    z-index: 10;
  }