*{ 
    padding: 0; 
    margin: 0; 
    1 rem = 16px;
} 
body{ 
    background-color:#000; 
} 

.blank{ 
    background-color:blank; 
} 
#snake{ 
    position: absolute;
    width: 1rem;
    height: 1rem;
    background-color:white; 
} 
.wall{ 
    background-color:green; 
} 
#fruit{ 
    position: absolute;
    width : 1rem;
    height: 1rem;
    background-color:red; 
}