input[type='text'] {
  width: 100%;
  max-width: 400px;
  box-sizing: border-box;
  border: none;
  border-bottom: 2px solid silver;
  font-size: 20px;
  margin-bottom: 20px;
  margin-top: 20px;
}

button {
  border: 2px solid silver;
  background-color: white;
  font-size: 16px;
  padding: 10px;
  padding-left: 40px;
  padding-right: 40px;
  border-radius: 10px;
  margin-bottom: 20px;
  margin-top: 20px;
  cursor: pointer;
}

button:active {
  border-color: black;
}

#container {
  border: 2px green dashed;
  padding: 20px;
}