* {
    padding: 0;
    margin: 0;
    font-family: 'Century Gothic', sans-serif;
    text-align: center;
}

form {
    padding: 50px 20px;
    background-color: #ededed;
    margin: 70px auto; /* centrar verticalmente */
    max-width: 400px; /* limitar el ancho del formulario */
    box-sizing: border-box; /* incluir padding y border en el ancho */
    filter: var(--sombra);
  filter: drop-shadow(2px 2px 4px rgb(255, 255, 255));
  filter: -webkit-drop-shadow(2px 2px 4px rgb(255, 255, 255));
  /* Safari y Chrome antiguo */
  filter: -moz-drop-shadow(2px 2px 4px rgb(255, 255, 255));
  /* Firefox antiguo */
  filter: -ms-drop-shadow(2px 2px 4px rgb(255, 255, 255));
  /* Internet Explorer */
  filter: -o-drop-shadow(2px 2px 4px rgb(255, 255, 255));
  /* Opera */
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.8),
    0 0 20px rgba(255, 255, 255, 0.6),
    0 0 30px rgba(255, 255, 255, 0.4),
    0 0 40px rgba(255, 255, 255, 0.2);
}

h1 {
    text-align: center;
    padding: 12px;
    color: #444;
}

input, textarea {
    width: calc(100% - 20px);
    padding: 9px;
    margin: 12px auto;
    font-size: 16px;
    box-sizing: border-box;
    filter: var(--sombra);
  filter: drop-shadow(2px 2px 4px rgb(255, 255, 255));
  filter: -webkit-drop-shadow(2px 2px 4px rgb(255, 255, 255));
  /* Safari y Chrome antiguo */
  filter: -moz-drop-shadow(2px 2px 4px rgb(255, 255, 255));
  /* Firefox antiguo */
  filter: -ms-drop-shadow(2px 2px 4px rgb(255, 255, 255));
  /* Internet Explorer */
  filter: -o-drop-shadow(2px 2px 4px rgb(255, 255, 255));
  /* Opera */
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.8),
    0 0 20px rgba(255, 255, 255, 0.6),
    0 0 30px rgba(255, 255, 255, 0.4),
    0 0 40px rgba(255, 255, 255, 0.2);
}

input[type='submit'] {
    background-color: #48e;
    color: #fff;
    width: calc(80% - 20px);
    margin: 12px auto;
    border: none;
    cursor: pointer;
}

.ok {
    text-align: center;
    width: 100%;
    padding: 12px;
    background-color: #1e6;
    color: #fff;
}

.bad {
    text-align: center;
    width: 100%;
    padding: 12px;
    background-color: #a22;
    color: #fff;
}

@media (max-width: 768px) {
    form {
        padding: 30px;
    }
}