/* Bare Bones Functionality:  */
.container {
  position: relative;
}
input.toggle {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
  opacity: 0;
}

input.toggle:checked ~ .answer {
  display: none;
}

/* Small styling for less eye pain:  */

body {
  font-size: 18px;
}

h1 {
  width: 320px;
  min-width: 320px;
  margin: 2rem auto;
}

.container {
  width: 320px;
  margin: 0 auto;
  padding: 1rem;
  border: 1px solid black;
}
.answer {
  position: relative;
  margin-top: 1rem;
}
.question {
  display: flex;
  width: 100%;
  font-weight: 700;
  padding-right: -2rem;
  background: url("x.svg") no-repeat right ;
  background-size: 18px;
}
input.toggle:checked ~ .question {
  background: url("plus.svg") no-repeat right;
  background-size: 18px;
}
pre {
  width: 280px;
  background-color: lightgray;
  font-size: 13px;
}

@media only screen and (min-width: 480px) {
  pre {
    width: 350px;
    font-size: 15px;
  }
  .container {
    width: 400px;
    min-width: 320px;
    margin: 0 auto;
    padding: 1rem;
    position: relative;
    border: 1px solid black;
  }
}