style.css

/*General rules*/

body {
  margin: 0;
  padding: 0;
  width: 70%;
  min-height: 100%;
  margin: auto;
}

section {
  width: 100%;
  height: 100%;
}

/*Titles rules*/
h1, h3 {
  font-size: 1.5em;
}

h2 {
  font-size: 2em;
}

h3 {
  border-bottom: 3px solid #9ee493;
  width: 50%;
}

h4 {
  color: #2f4858;
  font-weight: bold;
}

/*Shared rules*/

header p, .info {
  font-style: italic;
}

header section, .container h2 {
  text-align: center;
}

header {
  background-color: #2f4858;
  color: white;
}

header aside, header section, section aside, .container {
  display: inline-block;
}

header aside, header section {
  vertical-align: middle;
}

 section aside, .container {
  vertical-align: top;
 }

 /*Particular rules*/

header section {
  width: 55%;
}

img {
  width: 60%;
}

section aside {
  background-color: #86bbd8;
  width: 24%;
  height: 920px;
  padding-left: 1em;
  border-top: 5px solid #9ee493;
}

section aside ul {
  list-style-type: none;
}

section aside li {
  margin: 5% 0;
}

.container {
  width: 71.5%;
  padding-left: 1em;
  background-color: #faf8f8;
}

article {
  width: 100%;
  margin: 5% 0;
}