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

:root {
  --orage: hsl(25, 97%, 53%);
  --light--gray: hsl(217, 12%, 63%);
  --dark-blue: hsl(213, 19%, 18%);
  --very-dark-blue: hsl(216, 12%, 8%);
}

html {
  font-size: 62.5%;
}

body {
  font-size: 15px;
  font-family: "Overpass", serif;
  background-color: var(--very-dark-blue);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 2rem;
}

.main-container {
  background: linear-gradient(120deg, var(--dark-blue), hsl(204, 19%, 8%));
  display: flex; /* Use flexbox to center content */
  flex-direction: column;
  align-items: center;
  max-width: 40rem;
  margin: 0 auto;
  min-width: auto;
  padding: 3rem;
  border-radius: 2rem;
}

.form-container {
  width: 100%;
  max-width: 40rem;
  opacity: 1;
  visibility: visible;

  position: relative;
  transition: visibility 0s, opacity 1s ease-in-out;
}

.image-container {
  background-color: hsla(211, 19%, 24%, 0.461);
  padding: 1rem;
  border-radius: 50%;
  margin-bottom: 3rem;
  width: 4rem;
}

.content-text h1 {
  color: white;
}

.content-text p {
  margin-top: 2rem;
  color: var(--light--gray);
}

.numbers {
  margin-top: 3rem;
  display: flex;
  gap: 2rem;
}

.number {
  color: var(--light--gray);
  background-color: hsla(211, 19%, 24%, 0.461);
  width: 5rem;
  height: 5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 50%;
  font-size: 2rem;
}

.white {
  background-color: white;
  color: var(--very-dark-blue);
}

.number:hover {
  background-color: var(--orage);
  cursor: pointer;
  color: var(--very-dark-blue);
}

.submit-btn-container {
  margin-top: 3rem;
  display: flex;
  justify-content: center;
}
.btn-submit,
.btn-submit:visited {
  background-color: var(--orage);
  border: none;
  padding: 1rem 15rem;
  border-radius: 5rem;
  color: var(--very-dark-blue);
  font-size: 1.5rem;
  font-weight: 500;
}

.btn-submit:hover {
  color: var(--very-dark-blue);
  background-color: white;
  cursor: pointer;
}

.thanks-container {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 40rem;
  padding: 0 2rem;
  opacity: 0;
  visibility: hidden;
  transition: visibility 0s, opacity 1s ease-in-out;
}

.selected {
  margin-top: 3rem;
  background-color: hsla(211, 19%, 24%, 0.461);
  padding: 1rem 2rem;
  border-radius: 5rem;
  color: var(--orage);
}

.thanks {
  margin-top: 4rem;
  color: white;
}

.message {
  color: var(--light--gray);
  margin-top: 1rem;
}

@media (max-width: 40em) {
  html {
    font-size: 50%;
  }
}