style.css

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

body {
    background-color: #fafafa;
    width: 80%;
    height: 80%;
    margin: 0 auto;
    padding-top: 200px;
}

.espaco {
    height: 100px;
}

.pontos p {
    text-align: right;
    color:grey;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 20px;
}

.titulo h1{
    text-align: center;
    color: #666666;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 40px;
}

.titulo h3 {
    text-align: center;
    color:grey;
    font-family: Arial, Helvetica, sans-serif;
}

.titulo p {
    text-align: center;
    color:grey;
    font-family: Arial, Helvetica, sans-serif;
}

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

.fim-de-jogo{
    text-align: center;
    color: #666666;
    margin-top: 80px;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 40px;
}
.total-pontos {
    color:grey;
    text-align: center;
    color: #666666;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 20px;
}

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

.background{
    position: relative;
    background-image: url(img/background.png);
    background-repeat: repeat-x;
    animation: slideright 2000s infinite linear;
    width: 100%;
    height: 200px;
}