* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}
header {
  background-color: aquamarine;
  text-align: center;
  padding: 10px 0;
}
body {
  width: 900px;
  margin: 0 auto;
}
aside {
  background-color: whitesmoke;
  float: left;
  width: 250px;
  padding: 10px;
}
aside > input, select {
  width: 100%;
}
aside > section#ad > a > img {
  margin-top: 50px;
  width: 100%;
}
section#right {
  background-color: burlywood;
  float: right;
  width: 650px;
  padding: 10px;
}
section#right > table > tr > td {
  width: 25%;
  display: inline-block;
}
section#right > table > tr > td > input {
  width: 100%;
}
footer {
  background-color: cornflowerblue;
  clear: both;
  padding: 10px;
}

input, select {
  padding: 5px 7px;
}
input[type='submit'],
input[type='button'] {
  border: solid gray 1px;
  border-radius: 10px;
}