* {
  box-sizing: border-box;
  font-family: "Roboto Slab", serif;
  --clr-primary: #5fcf80;
  --clr-bg: #576366;
  --clr-btn: #326e99;
  --clr-err: #d11818;
}

/* ===== DRY ===== */

main,
body,
form {
  display: flex;
  flex-direction: column;
  align-items: center;
}

main,
label,
select,
button {
  width: 100%;
}

select,
button {
  border-radius: 5px;
  cursor: pointer;
}

label,
button,
#error-message,
#success-message {
  font-weight: bold;
}

h1,
select,
#error-message,
#success-message {
  text-align: center;
}

#error-message,
#success-message,
select,
button {
  font-size: 1.5rem;
}

#error-message,
#success-message {
  animation: message 2s linear;
  margin-block: auto;
  text-shadow: 1px 1px black;
}

h1,
button {
  color: var(--clr-primary);
  text-shadow: 2px 2px black;
}

/* =============== */

main {
  margin-block: auto;
}

body {
  height: 90vh;
  background-color: var(--clr-bg);
}

h1 {
  font-size: 4rem;
  margin-bottom: 4rem;
}

form {
  min-width: 300px;
  width: 50%;
  max-width: 400px;
  height: 50vh;
  padding: 1.5rem;
  border: 3px solid black;
  border-radius: 15px;
  background-color: var(--clr-primary);
}

label {
  margin-bottom: 0.5rem;
}

select {
  margin-bottom: 2rem;
  height: 3rem;
}

button {
  height: 4rem;
  padding: 0.5rem;
  color: var(--clr-primary);
  background-color: var(--clr-btn);
}

#error-message {
  color: var(--clr-err);
}

#success-message {
  color: var(--clr-btn);
}

@keyframes message {
  0%,
  7% {
    transform: rotateZ(0);
  }
  15% {
    transform: rotateZ(-15deg);
  }
  20% {
    transform: rotateZ(10deg);
  }
  25% {
    transform: rotateZ(-10deg);
  }
  30% {
    transform: rotateZ(6deg);
  }
  35% {
    transform: rotateZ(-4deg);
  }
  40%,
  100% {
    transform: rotateZ(0);
  }
}