.persona__imagen {
    background: red;
    height: 300px;
    width: 300px;
}

.persona__imagen--roberta {
    background: url("../../img/personas/roberta.jpg");
}

.persona__imagen--marcela {
    background: url("../../img/personas/marcela.jpg");
}


.persona__imagen--andrea {
    background: url("../../img/personas/andrea.jpg");
}

.persona__imagen {
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    border-radius: 100%;
    height: 300px;
    width: 300px;
}