style.css

/*Reset*/
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: #000000;
  color: #ffffff;
  text-align: center;
  font-family: sans-serif;
}

#container {
  margin-top: 6.25rem;
  width: 80%;
  max-width: 37.5rem;
  margin-inline: auto;
}

h1 {
  margin-top: 2.5rem;
  margin-bottom: 0.625rem;
  opacity: 0.9;
}

p {
  margin-bottom: 2.5rem;
  opacity: 0.7;
}

input,
button {
  display: block;
  width: 100%;

  padding: 1.25rem;
  font-size: 1.25rem;
  border-radius: 0.25rem;
}

input {
  margin-bottom: 1.25rem;
  border: none;
  outline: none;
}

input[type="text"]:focus {
  border-color: #04c35c;
}

input[type="text"] {
  border: 1px solid #8a2be2;
}

button {
  border: none;
  background-color: #8a2be2;
  color: #ffffff;
  transition: filter 0.2s;
}

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

#resposta {
  margin-top: 1.875rem;

  transition: opacity 1s;
}

#resposta div {
  font-size: 1rem;
  font-weight: normal;
  opacity: 0.9;
  margin-bottom: 0.625rem;
}