* {
    box-sizing: border-box;
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}
body {
    background-image: url(photo.jpg);
    background-attachment: scroll;
    background-attachment: fixed;
}

header {
    opacity: 0;
    text-align: center;
    padding: 0;
    font-size:px;
    -webkit-text-fill-color: transparent;
    -webkit-text-stroke-width: 1px;
    -webkit-text-stroke-color: white;
    text-shadow: 8px 8px #ff1f8f,20px 20px #000000;
    transition: opacity 1s;
}
header:hover {
    opacity: 100;
}

.container {
    max-width: 700px;
    margin: auto;
    padding: 20px;
}
section {
    border: 2px solid #5624d0;
    border-radius: 7px;
    padding: 10px;
    margin: 10px 0;
    background-image: url(https://estaticos.muyinteresante.es/media/cache/680x_thumb/uploads/images/pyr/55520750c0ea197b3fd5132c/banderagay.jpg);
    background-attachment: scroll;
    background-attachment: fixed;
    color: black;
    text-shadow: white;
}

section:hover {
    opacity: 1;
    visibility: visible;
}

label {
    display: block;
    padding: 7px;
    border-radius: 7px;
    cursor: pointer;
    border: 1px dashed black;
    margin-bottom: 3px;
}

label:hover {
    background: crimson;

}

button {
    width: 80%;
    display: block;
    margin: auto;
    padding: 10px;
    background-color: #5624d0;
    border: none;
    cursor: pointer;
}
button:hover{
    background: lightcoral;
    color: #fff;
}

h2 {
    text-align: center;
}

#resultado {
    font-size: 30px;
    color: darkred;
}