styles.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800&display=swap');
*{
    padding: 0;
    margin: 0;
    font-family: poppins,sans-serif;
}

body{
    background-repeat: no-repeat;
    background-image: url('https://cdn.pixabay.com/photo/2016/03/22/15/29/blue-1273089_1280.jpg');
    background-size: 100%;
}
form{
    background-color: #fff;
    border-radius: 1.5rem;
    background-color: none;
    width: 400px;
    padding: 20px;
    margin: 20px;
    display: flex;
    flex-direction: column;
    box-shadow: rgba(50, 50, 93, 0.25) 0px 6px 12px -2px, rgba(0, 0, 0, 0.3) 0px 3px 7px -3px;
}

form label{
    font-size: 1.2rem;
    color: #000;
}

.form-container{
    margin-top: 4.5rem;
    display: flex;
    justify-content: center;
}

.head-form h1{
    font-size: 1.6rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 0.3rem;
}

.head-form p{
    text-align: center;
    font-size: 1rem;
}

.user-data .campo{
    display: flex;
    flex-direction: column;
}
.campo{
    position: relative;
}
.user-data span{
    position: absolute;
    top: 2.8rem;
}

.user-data input{
    border-radius: .2rem;
    margin-top: 4px;
    border: none;
    border-bottom: solid #000 1px;
    padding: 5px 0 0 30px;
}

.user-data label{
    font-weight: 500;
    margin-top: 10px;
}

.factura-section{
    margin-top: 1rem;
    margin-bottom: 1rem;
}

.genero-section{
    margin-top: 40px;
    display: flex;
    flex-direction: column;
}

.genero-section label{
    color: rgb(27, 27, 27);
    font-size: 1rem;
}

#header{
    font-weight: 600;
}
.genero-section input[type="radio"]{
    margin-right: 0.2rem;
}

.factura-section input[type="checkbox"]{
    margin-right: .2rem;
}

.factura-section label{
    font-size: 1rem;
}
.envio-container{
    display: flex;
    flex-direction: column;
}

.envio-container label{
    font-size: 1rem;
    margin-bottom: 1rem;
}

.envio-container select{
    width: 300px;
    margin-bottom: 2rem;
}

.button-container{
    display: flex;
    justify-content: center;
}

.button-64 {
    align-items: center;
    background-image: linear-gradient(144deg,#AF40FF, #5B42F3 50%,#00DDEB);
    font-size: 20px;
    color: #fff;
    max-width: 100%;
    max-height: 100%;

  }
  
  .button-64:active,
  .button-64:hover {
    outline: 0;
  }
  
  .button-64 span {
    background-color: rgb(0, 0, 0);
    padding: 0.5px 90px;
    border-radius: 6px;
    width: 100%;
    height: 100%;
    transition: 300ms;
  }
  
  .button-64:hover span {
    background: none;
  }
  
  @media (min-width: 768px) {
    .button-64 {
      font-size: 24px;
      min-width: 196px;
    }
  }

/*Estilos de recibe.php*/

header{
    margin-top: 3rem;
    text-align: center;
    font-size: 2rem;
    font-weight: bold;
}

.main-container{
    display: flex;
    justify-content: center;
}
main{
    padding: 2rem;
    width: 400px;
    border: solid black 1px;
    margin-top: 2rem;
    justify-content: center;
    align-items: center;
}

.parametros{
    display: flex;
    justify-content: center;
    flex-direction: column;
}
.parametros input{
    width: 200px;
}
.preferencias{
    margin-top: 1rem;
}