button{
    margin-left: auto;
    margin-right: auto;
    height: 70%;
    width: 10%;
}
body{
    background-image: url(imagenes/descarga.jpg);
    justify-content: center;
    align-items: center;
    text-align: center;
    background-position: center;
    background-attachment: fixed;
    background-size: cover;
     margin-left: auto;
    margin-right: auto;
}
a{
    color: rgb(35, 4, 113);
     text-decoration: none;
      font-size: 18px;
    display: block;
    font-weight: bold;
    transition: color 1s;   
}
a:hover{
    color: rgb(231, 118, 224);
}