html, body {
  margin: 0;
  padding: 0;
  border: 0;
}

body{
  line-height: 1;
/*  letter-spacing: .1rem;
  word-spacing: .15rem;*/
  background-color: #ffffff;
}

.flex-container {
  display: flex;
}

header {
  background-color: indianred;
}

header > div {
  text-align: center;
  padding: 10px;
}


.flex-container-main {
  display: flex;
  flex-direction: row;
}

.flex-container-content {
  width: 100%;
  padding: 10px;
}

.aside-1 {
  background-color: yellow;
  text-align: center;
}

.main-article {
  background-color: blue;
  color: white;
  text-align: left;
}

.column-3 {
  background-color: magenta;
  color: blue;
  text-align: left;
}

.aside-2 {
  background-color: mistyrose;
  text-align: center;
}

footer {
  background-color: mediumseagreen;
}

footer > div {
  text-align: center;
  padding: 10px;
}