:root {
  --padding: 1.5rem;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: 'Karla', sans-serif;
  font-size: 1rem;
  line-height: 1.25;
  background-color: hsl(204, 43%, 93%);
  color: hsl(0, 0%, 100%);
  letter-spacing: -0.038rem;
}
.subscription {
  margin: 4.5rem auto; /*72px*/
  width: 83%;
  max-width: 635px;
  border-radius: 5px;
  overflow: hidden;
}
.header {
  background-color: hsl(0, 0%, 100%);
  color: hsl(218, 22%, 67%);
  font-size: 0.9375rem; /* 15px*/
  padding: 2rem var(--padding);
}
.header h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: hsl(179, 62%, 43%);
  margin-bottom: 1.5rem;
}
.strong {
  color: hsl(71, 73%, 54%);
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 1.5rem;
}
.par {
  line-height: 1.74;
}
.split {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px,1fr));
}
.monthly {
  background-color: hsl(179, 62%, 43%);
  padding: var(--padding);
}
.monthly h2, .why-us h2 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}
.price {
  font-weight: 700;
  font-size: 2rem;
  vertical-align: middle;
  margin-right: 0.5rem;
}
.call-to-action:link, .call-to-action:visited,
.call-to-action:hover, .call-to-action:active {
  display: block;
  border-radius: 5px;
  background-color: hsl(71, 73%, 54%);
  text-decoration: none;
  color: hsl(0, 0%, 100%);
  text-align: center;
  padding: 1rem;
  box-shadow: 5px 5px 10px hsla(0, 0%, 0%, 0.3);
  margin-top: 1.5rem;
  font-weight: 700;
}
.why-us {
  background-color: hsl(179, 52%, 53%);
  font-size: 0.9375rem;
  padding: var(--padding);
}
.why-us ul {
  list-style-type: none;
  line-height: 1.35;
}

@media only screen and (min-width: 603px) {
  .container {
    height: 100vh;
    display: grid;
    position: relative;
  }
  .subscription {
    margin: auto;
  }
  footer {
   position: absolute;
   bottom: 20px;
   left: 50%;
   transform: translateX(-50%);
 }
}
@media only screen and (min-width: 715px) {
  :root {
    --padding: 2.5rem;
  }
  .call-to-action:hover, .call-to-action:active {
    background-color: hsl(71, 73%, 44%);
  }
}