.pelota {
    width: 20%;
    text-align: center;
    float: left;
    margin: 10px;
    padding: 10px;
    font-family: "Franklin Gothic Medium", "Arial Narrow", Arial, sans-serif;
    }
img {
    width: 100%;
    }
#contenido {
    width: 80%;
    background-color: rgb(215, 215, 92);
    }