style.css

@import url("https://fonts.googleapis.com/css?family=Poppins:400,500,600,700&display=swap");

* {
  box-sizing: border-box;
}

body {
  background-color: hsl(0, 100%, 74%);
  background-image: url("/images/bg-intro-desktop.png");
  color: #fff;
  font-family: "Poppins", sans-serif;
}

.container {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  max-width: 1200px;
  margin: 0 auto;
  min-height: 100vh;
}

.container > div {
  flex: 1;
  padding: 0 20px;
}

h1 {
  font-size: 40px;
  line-height: 50px;
}

p {
  font-size: 15px;
  opacity: 0.8;
}

.box {
  background-color: #fff;
  border-radius: 5px;
  box-shadow: 0 6px rgba(0, 0, 0, 0.2);
  padding: 30px;
  margin-bottom: 20px;
  text-align: center;
}

.box p {
  margin: 0;
}

.box-blue {
  background-color: hsl(248, 32%, 49%);
  padding: 20px;
}

.form-control {
  position: relative;
  margin-bottom: 30px;
}

.form-control small {
  color: hsl(0, 100%, 74%);
  font-weight: 600;
  position: absolute;
  bottom: -24px;
  right: 0;
  opacity: 0;
  text-align: right;
}

input {
  border-radius: 5px;
  border: 1.3px solid hsl(246, 25%, 77%);
  font-family: "Poppins", sans-serif;
  font-size: 14px;
  font-weight: 500;
  padding: 15px 25px;
  display: block;
  width: 100%;
}

.form-control.error input {
  border-color: hsl(0, 100%, 74%);
  color: hsl(0, 100%, 74%);
}

.form-control.error input::placeholder {
  color: hsl(0, 100%, 74%);
}

.input:focus {
  border: 1.3px solid hsl(248, 32%, 49%);
  outline: none;
}

.form-control img {
  opacity: 0;
  position: absolute;
  top: 50%;
  right: 15px;
  transform: translateY(-50%);
  height: 20px;
}

.form-control.error img {
  opacity: 1;
}

button {
  background-color: hsl(154, 59%, 51%);
  border-radius: 5px;
  border: 1px solid hsl(154, 59%, 45%);
  box-shadow: 0 2px hsl(154, 59%, 45%);
  color: #fff;
  cursor: pointer;
  padding: 15px 25px;
  display: block;
  font-size: 14px;
  width: 100%;
  text-transform: uppercase;
  font-weight: 500;
  letter-spacing: 1px;
  font-family: "Poppins", sans-serif;
}

button:focus {
  outline: none;
}

button:active {
  box-shadow: 0 0 hsl(154, 59%, 45%);
  transform: translateY(2px);
}

.form-control small {
  opacity: 0;
}

.form-control.error small {
  opacity: 1;
}

small {
  display: inline;
  color: #bbb;
  font-size: 14px;
  font-weight: 500;
  margin-top: 15px;
}

small a {
  color: hsl(0, 100%, 74%);
  font-weight: 600;
  text-decoration: none;
}

@media (max-width: 767px) {
  .container {
    flex-direction: column;
  }
}