.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);
}