style.css

@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap");
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

*::after,
*::before {
  margin: 0;
  padding: 0;
}

.attribution {
  position: absolute;
  padding-top: 2vh;
  left: 50%;
  transform: translateX(-50%);
  font-weight: 600;
  font-size: 12px;
  text-align: center;
  letter-spacing: 2px;

  color: var(--light);
}
.attribution a {
  color: hsl(228, 45%, 44%);
  font-weight: 700;
}
:root {
  --red: hsl(0, 100%, 74%);
  --Green: hsl(154, 59%, 51%);
  --light: hsl(0, 0%, 100%);
  --dark: hsl(0, 0%, 0%);

  --accent: hsl(248, 32%, 49%);

  --neutralDarkBlue: hsl(249, 10%, 26%);
  --neutralGrayishBlue: hsl(246, 25%, 77%);
}
.container {
  padding: 0 1.5rem;
  padding-top: 6.125rem;
}
body {
  width: 100%;
  min-height: 100vh;
  font-family: "Poppins", sans-serif;

  background: url(images/bg-intro-mobile.png);
  background-size: cover;
  background-color: var(--red);

  padding-bottom: 1rem;
}

main {
  position: relative;
  display: grid;

  text-align: center;
  color: var(--light);
}

.text-content h1 {
  font-size: clamp(1.5rem, 8vw, 3.125rem);
  line-height: 2.5rem;
}

.text-content > p:first-of-type {
  margin-top: 1.875rem;
  color: var(--light);
  opacity: 0.8;
}

.card,
input {
  width: 100%;
}

.card-holder {
  margin-top: 4.375rem;
}

button {
  outline: none;
  border: none;
  width: 100%;
  padding: 1.25rem 5rem;
  border-radius: 10px;

  transform: scale(1);
  box-shadow: 0 7.5px 0px 0px rgba(0, 0, 0, 0.2);

  transition: all 0.3s ease;
}

button:hover {
  transform: translateY(1px);
  transition: all 0.3s ease;
}
button:active {
  /* transform: translateY(2px); */
  transform: scale(0.9);
  transition: all 0.3s ease;
}
.card-holder .card-offers {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5rem;

  background: var(--accent);
  color: var(--neutralGrayishBlue);
}

.card-offers span {
  color: var(--light);
  font-weight: 700;
}

.card-form {
  margin-top: 1.5rem;
  padding: 1.5rem;
  border-radius: 10px;

  background: var(--light);
  box-shadow: 0 10px 0 0 rgba(0, 0, 0, 0.2);
}

form input {
  font-size: 1rem;
  font-weight: 700;
  padding: 1.25rem 1rem;
  outline: none;
  border: 1px solid var(--neutralGrayishBlue);

  border-radius: 7.5px;

  background: url(images/icon-error.svg) no-repeat;
  background-position: right 7px center;
  background-size: 0%;

  transition: background-size 0.5s ease;
}

form input:focus {
  outline: 1px solid var(--dark);
}

form p {
  margin-bottom: 5px;
}

form p {
  float: right;
  font-size: 0.7rem;
  font-style: italic;
  color: var(--red);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card-form button {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1rem;

  color: var(--light);
  background: var(--Green);

  text-transform: uppercase;
  padding: 0 2.6rem;
  padding-top: 1.375rem;
  padding-bottom: 1rem;
  box-shadow: 0 5px 1px 0 hsl(154, 59%, 46%);
}
.card-form button:hover {
  background: hsla(154, 59%, 51%, 0.8);
}
.card-form > p:last-of-type {
  font-size: 0.65rem;
  color: var(--neutralGrayishBlue);
  padding: 0 1.375rem;
  font-weight: 600;
  margin-top: 0.8rem;
}

.card-form > p:last-of-type a {
  font-weight: 700;
  color: var(--red);
  text-decoration: none;
}

.InputErrorShow {
  background-size: 5%;
  transition: background-size 0.5s ease;
}

.errorTextShow {
  opacity: 1;
  transition: opacity 0.3s ease;
}

@media (min-width: 45em) {
  body {
    display: flex;
    flex-direction: column;
    background: url(images/bg-intro-desktop.png);
    background-size: cover;
    background-color: var(--red);

    padding: 0 2rem;
  }

  .container {
    max-width: 68.75rem;
    padding: 0;
  }

  main {
    margin: auto;
    grid-template-columns: 1fr 1fr;
    column-gap: 4.6rem;

    align-items: center;
  }

  .text-content {
    text-align: left;
  }

  .text-content h1 {
    line-height: 3.5rem;
  }
  .card-holder {
    margin-top: 0;
  }

  .card-form {
    padding: 2.5rem;
  }
}