body{
}
#container{
  width: 900px;
  margin: 50px auto
}
.header, .content, .picture, .footer{
  float: left;
}
.header{
  width: 900px;
  height: 100px;
  margin: 0 0 10px;
  background-color:red;
}
.content{
  width: 700px;
  height: 500px;
  margin:50px 0 0 0;
  background-color:red;
}
.picture{
  width: 200px;
  height: 300px;
  margin: 20px 0 20px 10px;
  background-color:red;
}
.footer{
  width: 100%;
  height: 100px;
  margin: 0 10px 0 0;
  background-color:red;
}