html, body { font-size: 16px; } 
body {
    background:lightpink;
}

.clearfix:after {
    display:block;
    clear:both;
}



header {
  width:1200px;
  background-color:#bd2e40;
  font-family:"Times New Roman", serif;
  float:left;
  font-size:1.2rem;
  text-align:center;
}
h1 {
  margin: 15px 0px;
}
h3 {
  margin: 0px;
}

section {
  width: 1180px;
  background-color:white;
  float:left;
  font-family:"Verdana", "Arial", sans-serif;
  padding:0px 10px 0px 10px;
}
aside {

  background-color:lightgrey;
  font-family:"Times New Roman", serif;
  padding:10px 10px 10px 10px;
  float:right;
}
footer {
    background-color:black;
   font-family:"Times New Roman", serif;
    color:white;
    clear:both;
    text-align:center;
    padding:5px;
}
div.ex1 {
    width:1200px;
    margin: auto;
}