:root {
  --white: white;
  --background: rgba(0, 0, 0, 0.747);
  --black: black;
  --green: #37af65;
  --red: #af3737;
}

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

body {
  width: 100%;
  font-family: Poppins, sans-serif;
  font-size: 1.2rem;
  color: var(--white);
  background-image: url(assets/background1920.jpg);
  background-position: center center;
  background-repeat: no-repeat;
  background-size: cover;
}

#title {
  margin: 50px 0 10px 0;
}

#description {
  font-style: italic;
  margin-bottom: 50px;
}

.text-shadow {
  text-shadow: 2px 2px var(--background);
}

.centered {
  text-align: center;
}

.uppercase {
  text-transform: uppercase;
}

.w100 {
  display: block;
  width: 100%;
  background-color: var(--white);
  border: none;
  border-radius: 5px;
}

.p10 {
  padding: 10px;
}

.mb20 {
  margin-bottom: 20px;
}

.mb5 {
  margin-bottom: 5px;
}

.ml5 {
  margin-left: 5px;
}

.clue {
  font-size: .9rem;
  font-style: italic;
}

#survey-form {
  min-width: 300px;
  max-width: 700px;
  margin: 0 auto;
  padding: 50px;
  border-radius: 5px;
  background-color: var(--background);
}

select, input, textarea {
  font-family: Poppins, sans-serif;
  font-size: 1rem;
}

input::placeholder, textarea::placeholder {
  color: var(--black);
}

input[type="checkbox"] {
  width: unset;
  display: inline;
}

input[type="checkbox"], input[type="radio"] {
  transform: scale(1.5);
}

textarea {
  margin-bottom: 50px;
  resize: vertical;
}

input[type="submit"] {
  cursor: pointer;
  color: var(--white);
  font-weight: bold;
  background-color: var(--green);
}

form:invalid input[type="submit"] {
  background-color: var(--red);
}