*{
    padding: 0;
    margin: 0;
}
body{
    padding: 2rem;
}
#game{
    width: 900px;
    height: 500px;
    border: 1px solid rgb(255, 101, 101);
    margin: auto;
    overflow: hidden;
    border-radius: 1rem;
    background-color: rgb(254, 243, 245);
}
#character{
    width: 300px;
    height: 150px;
    background-color: rgb(255, 86, 86);
    position: relative;
    top: 200px;
    left: 300px;
    border-radius: 2rem;
}
#block{
    top: 500px;
    position: relative;
    width: 300px;
    height: 150px;
    background-color: rgb(137, 93, 249);
    animation: slide .9s infinite linear;
    border-radius: 2rem;
}
@keyframes slide{
    0%{top: -100px};
    1000%{top: 500px};
}
#left, #right{
    width: 50%;
    position: absolute;
    height: 500px;
}
#right{
    left: 50%;
}