body,
html,
header,
h1 {
  margin: 0px;
  padding: 0px;
}

body {
  font-family: helvetica;
}

header,
body,
html {
  width: 100%;
  height: 100%;
}


header {
  background: url("https://www.globalia.ca/medias/images/programmation-web.jpg") no-repeat center center;
  background-size: cover;
  color: white;
}

.wrapper {
  display: table;
  width: 100%;
  height: 100%;
}

.content {
  display: table-cell;
  text-align: center;
  vertical-align: middle;
  text-shadow: 1px 1px 10px black;
}

.centre {
    display: table-cell;
    text-align: center;
    vertical-align: middle;
}

.displayed {
    display: block;
    margin-left: auto;
    margin-right: auto }
    
h1 {
  font-size: 65px;
}


main {
  max-width: 700px;
  margin: 80px auto;
}

h2 {
	font-size: 31px;
}

h3 {
	font-size: 20px;
}

h4{
	font-size: 65px;
}

h5{
	font-size: 35px;
}

body ul{
  list-style-type: none;
}

.p1{
  border: 8px #333333 double;
}