.game{ width: 600px; height: 200px; border-bottom: 1px solid #000; margin: auto; } #dino{ width: 50px; height: 50px; background-image: url(img/dino.jpg); background-size: 50px 50px; position: relative; top: 150px; } #cactus{ width: 20px; height: 40px; background-image: url(img/cactus.png); background-size: 20px 40px; position: relative; top: 110px; left: 580px; animation: cactusMov 2s infinite linear; } @keyframes cactusMov{ 0%{ left: 580px; } 100%{ left: -20px; } } .jump{ animation: jump 0.3s linear; } @keyframes jump{ 0%{ top: 150px; } 30%{ top: 130px; } 50%{ top: 80px; } 80%{ top: 130px; } 100%{ left: 1500px; } }