*{
    padding:0;
    margin:0;
}

body{
    background-color: #0a1f30;
}
h1, h3{
    color: aliceblue;
    font-family: 'consolas';
}

#game{
    width:400px;
    height:500px;
    border: 1px solid #000;
    border-radius: 3px;
    margin:auto;
    overflow: hidden;
    background-color: aqua;
}
#block{
    width:50px;
    height:500px;
    background-color: #000;
    position: relative;
    border-radius: 4px;
    left:400px;
    animation:block 2s infinite linear;
}
@keyframes block{
    0%{left:400px;}
    100%{left:-50px;}
}
#hole{
    width:50px;
    height:150px;
    background-color: aqua;
    position: relative;
    left:400px;
    top:-500px;
    animation:block 2s infinite linear;
}
#character{
    width:20px;
    height:20px;
    position: absolute;
    background-color: blue;
    top:100px;
    border-radius: 50%;
}