html { font: 20px / 1.5 "Helvetica Neue", Helvetica, Arial, sans-serif; }

body {
  max-width: 38rem;
  margin: auto;
  background-color: #a0d6d6;
}

div {
  background-color: #fff;
  padding: 1rem 2rem;
  border-radius: 20px;
}

header {
  line-height: 1.25;
  padding: 1rem 0;
  display: flex;
  justify-content: space-between;
}

header a { color: inherit; }

header a:first-child {
  font-size: 25px;
  font-weight: bold;
}

a {
  color: #268bd2;
  text-decoration: none;
}

a strong { color: inherit; }

a:hover, a:focus { text-decoration: underline; }

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.5rem;
  line-height: 1.25;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4, h5, h6 { font-size: 1rem; }
p { margin-top: 0; }
li + li { margin-top: 4px; }

img {
  max-width: 100%;
  border-radius: 5px;
}

.round {
  padding: .2em .6em .2em;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
  border-radius: 10px;
}