.lista1 li{
    list-style-type: none;
}

.lista1 a{
    color: green;
    text-decoration: none;
}

.lista1 li a:hover{
    color: purple;
}

.imagen{
    margin-left: 0;
    margin-right: 0;
}

.imagen img{
    width: 70px;
}

.regresar{
    margin-top: 400px;
    text-align: center;
    font-size: 25px;}
    .back{
        font-family: Verdana, Geneva, Tahoma, sans-serif;
        text-decoration: none;
        color: black;}
        .back:hover{
            text-decoration: underline;
}