* {
  margin: 0;
  box-sizing: border-box;
}

body {
  background-color: black;
  color: white;
  text-align: center;
  font-family: sans-serif;
}

.container {
  margin-top: 100px;
  width: 80%;
  max-width: 400px;
  margin-inline: auto;
}

h1 {
  margin-top: 10px;
  margin-bottom: 10px;
  opacity: 0.9;
}

p {
  margin-bottom: 40px;
  opacity: 0.7;
}

input,
button {
  display: block;
  width: 100%;
  padding: 20px;
  font-size: 20px;
}
input {
  margin-bottom: 20px;
}
/*por algum motivo o btn não alinhou com 100% width */
button {
  background-color: blueviolet;
  border: none;
  color: white;
  transition: filter 0.2;
}

button:hover {
  filter: brightness(1.2);
  cursor: pointer;
}

#respostaAleatoria {
  margin-top: 15px;
  margin-left: 50px;
  transition: opacity 1s;
}
#respostaAleatoria div {
  margin-bottom: 10px;
}