#left {
            width: 800px;
            height: 600px;
            float: left;
            position: relative;
        }

        #right {
            padding-left: 800px;
        }

        #background {
            width: 100%;
        }

        .grass {
            position: absolute;
            z-index: 1;
        }

        #grass1 {
            bottom: 0px;
            left: 0px;
        }

        #grass2 {
            bottom: 0px;
            left: 275px;
        }

        #grass3 {
            bottom: 0px;
            right: 0px;
        }

        .grass:hover {
            background-color: rgba(255, 255, 0, 0.5);
        }

        #over {
            text-align: center;
            color: red;
        }