body {
    background: #fafafa;
     margin: 200px 200px; width: 300px; height: 300px; 
}

.dino {
    position: absolute;
    bottom: 0;
    background-image: url(../image/dino.png);
    width: 60px;
    height: 60px;
}

.cactus {
    position: absolute;
    width: 60px;
    height: 60px;
    bottom: 0;

    background-image: url(../image/cactus.png);
}

.game-over {
    text-align: center;
    color: #666;
    margin: 50px 0;
    font-family: arial;
}

@keyframes slideright {
    from {
        background-position: 70000%;
    }
    to {
        background-position: 0%;
    }
}

.background {
    position: absolute;
    bottom: 0px;
    background-image: url('../image/background.png');
    background-repeat: repeat-x;
    animation: slideright 600s infinite linear;
    -webkit-animation: slideright 600s infinite linear;
    width: 100%;
    height: 200px;
}


.footer {
    position: fixed;
    left: 0;
    margin-top: 2rem;
    bottom: 0;
    width: 100%;
    background-color: red;
    color: white;
    text-align: center;
}