Teste

input[id^=“spoiler”]{
display: none;
}
input[id^=“spoiler”] + label {
display: block;
width: 200px;
margin: 0 auto;
padding: 5px 20px;
background: #e1a;
color: #fff;
text-align: center;
font-size: 24px;
border-radius: 8px;
cursor: pointer;
transition: all .6s;
}
input[id^=“spoiler”]:checked + label {
color: #333;
background: #ccc;
}
input[id^=“spoiler”] + label + .spoiler {
width: 90%;
height: 0;
overflow: hidden;
opacity: 0;
margin: 10px auto 0;
padding: 10px;
background: #eee;
border: 1px solid #ccc;
border-radius: 8px;
transition: all .6s;
}
input[id^=“spoiler”]:checked + label + .spoiler{
height: auto;
opacity: 1;
padding: 10px;
}

Teste

Cthulhu Crisis VictorSuzumura