@charset "UTF-8";

body {
  font-family: Arial;
  margin: 0;
  padding: 0;.
  font-size: 16px;
}

.page {
  max-width: 650px;
  margin: 10px auto;
}
* {
  box-sizing: border-box;
  outline: none;
}

button, .btn {
  display: inline-block;
  font-family: Arial;
  cursor: pointer;
  background: #df2228;
  color: white;
  padding: 10px 10px;
  border: none;
  border-radius: 5px;
  font-size: 16px;
  text-decoration: none;
}

.message {
  display: none;
  margin-top: 30px;
}

p {
  margin: 20px 0;
}

select {
  font-family: Arial;
  font-size: 16px;
  margin: 0 5px;
  width: 70px;
}

.incorrect {
  box-shadow: 0 0 4px 1px red;
}

.correct {
  box-shadow: 0 0 4px 1px green;
}