* {
    font-family: sans-serif;
}

#content {
    position: relative;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    border: 1px solid black;
    width: 600px;
    height: 800px;
    overflow: hidden;
    cursor: none;
}

#ship {
    position: absolute;
    left: 10px;
    bottom: 10px;
    width: 50px;
    height: 50px;
    background-color: black;
}

.obstacle {
    display: none;
    position: absolute;
    left: 200px;
    bottom: 400px;
    width: 50px;
    height: 50px;
    background-color: red;
}

#pause, #gameover {
    position: relative;
    padding-top: 20px;
    font-size: 42px;
    margin-left: auto;
    margin-right: auto;
    z-index: 10000;
    clear: both;
}

#level, #score {
    position: relative;
    font-size: 42px;
    float: right;
    padding-right: 20px;
    z-index: 10000;
    clear: both;
}