style.css

* {
	padding: 0;
    margin: 0;
    left: 0;
    right: 0;
}

#game {
	width: 400px;
	height: 500px;
	border: 1px solid black;
	margin: 50px auto;
    border-top: 20px solid brown;
    position: relative;
}

#character {
	width: 20px;
	height: 20px;
	background-color: red;
	border-radius: 50%;
	position: relative;
	top: 440px;
	left: 190px;
	z-index: 1000000;

}

.block-left {
	width: 400px;
	height: 20px;
	background-color: black;
	position: relative;
	top: 100px; 
    /* float: left; */
    margin-top: -20px;
}

.block-right {
	width: 40px;
	height: 20px;
	background-color: rgb(0, 0, 0);
	position: relative;
	top: 100px;  
    float: right;
    margin-top: -20px;
}

.background-image {
	position: absolute;
	width: 400px;
	height: 500px;
}

.right-control {
	background: cornflowerblue;
	height: 20px;
	width: 20px;
	border-radius: 50%;
}