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

body {
  background: #111;
  display: flex;
  justify-content: center;
  min-height: 100vh;
}

.wrap {
  width: 100%;
  max-width: 600px;
  min-width: 300px;
  background: #fff;
}

.wrap img {
  display: block;
  width: 100%;
  height: auto;
}

a.btn-cta {
  display: block;
  cursor: pointer;
  transition: opacity 0.15s;
}

a.btn-cta:hover {
  opacity: 0.88;
}

a.btn-cta:active {
  opacity: 0.70;
}