* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

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

.left {
  margin: 10px;
  text-align: center;
  display: flex;
  flex-direction: column;
  width: 50%;
  height: 600px;
  padding: 20px;
  background-color: aqua;
}

#right {
  margin: 10px;
  background-color: aqua;
  width: 50%;
}

#btn {
  margin-top: 20px;
  margin-left: auto;
  margin-right: auto;
  width: 150px;
  height: 40px;
}