img {
    width: 100%;
	height: auto;
}
.obligatorio {
	color: red;
	font-size: 20px;
}
textarea:focus {
  /* Destacado adicional para elementos que tienen el cursor */
  /* border: #000  10px solid; */
  outline: red 2px solid;
  /* box-shadow: 10px 1px 5px red; */
}
.form > li{
    list-style-type: none;
}
button {
	border: none;
	margin: 10px 0;
	padding: 10px;
	color: white;
	border-radius: 3px;
	cursor: pointer;
}
button[type="submit"]{
    background-color: magenta;
}
button[type="reset"]{
    background-color: cyan;
}
header {
	display: grid;
	grid-template-columns: 140px auto;
}
main {
	width: 768px;
	margin: auto;
}
#subtitulo{
    display: grid;
    grid-template-areas: 
    "subtitulo subtitulo subtitulo"
    "datos preferencias suscripcion";
}
h2{
    grid-area: subtitulo;
}
h2,h3{
    text-align: center;
}
h3 {
    display: flex;
    flex-direction: column;
    align-items: center;
}
h3:nth-child(2){
    grid-area: datos;
}
h3::before, legend::before {
    display: inline-flex;
    background-color: red;
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 35px;
    font-family: arial;
    justify-content: center;
    align-items: center;
    font-weight: bold;
}
h3:nth-child(2)::before, #datos legend::before {
    content: '1';
}
h3:nth-child(3)::before, #preferencias legend::before {
    content: '2';
}
h3:nth-child(4)::before {
    content: '3';
}
.columnas{
    display: grid;
    grid-template-columns: 1fr 1fr;
}