body {
  background-color: yellow;
  padding: 2rem;  
  font-family: Segoe, "Segoe UI", "DejaVu Sans", "Trebuchet MS", Verdana, "sans-serif";
}
header {
  display: block;
  width: 100%;
  height: 200px;
}
img {
  width: 100px;
}
.box{
  float: left;
  margin-right: 2rem;
}
.body {
  display: block;
  width: 100%;
}