style.css

body {
    background: #fff;
  
    font-size: 18px;
    margin: 0 4em 4em 4em;
}


h1,h2,h3,h4,h5,h6 {
    margin-top: 2em;
    margin-bottom: 0.5em;
}


h1.title {
  font-size: 70px;
  margin-top: 0.5em;
}

h2 {
  font-size: 30px;
}
h3 {
  font-size: 24px;
}
h4 {
  font-size: 18px;
}
h5 {
  font-size: 16px;
}
h6 {
  font-size: 12px;
}

pre {
    margin-left: 4em;
    margin-right: 4em;
}

div.code {
    font-family: "Courier New";
    border: 1px solid;
    border-color: #999999;
    background-color: #eeeeee;
    padding: 5px 10px;
    margin: 10px;
    border-radius: 5px;
    overflow: auto;
}

.challenge {
    margin: 4em;
    padding: 2em;
    border: 1px solid black;
    border-radius: 5px;
    background: #ddf;
}

.challenge > :first-child {
    margin-top: 0;
}


.objectives {
    margin: 4em;
    padding: 2em;
    border: 1px solid black;
    border-radius: 5px;
    background: #fed;
}

.objectives > :first-child {
    margin-top: 0;
}