body {
    margin: 0;
    overflow: hidden;
    background-color: gray;
 }

#gameArea {
    position: relative;
    width: 1000px;
    height: 1000px;
    background-color: black;
    border: 2px solid white;
    margin: auto;
    top: 20px;
}
.cursor, .target {
    position: absolute;
    border-radius: 50%;
}
.cursor {
    width: 20px;
    height: 20px;
    background-color: green;
    visibility: hidden;
}
.target {
    background-color: red;
}
#report {
    position: absolute;
    top: 400px;
    left: 350px;
    color: white;
    font-size: 2em;
}
#instructions { 
    position: absolute;
    left: 0px;
    top: 600px;
}