styles.css

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

body {
  background: #000;
  color: #fff;
  font-weight: 500;
  font-family: Arial, sans-serif;
}

ul {
  list-style: none;
}

.lg {
  font-size: 1.5rem;
}

/* button style */
.btn {
  text-decoration: none;
  color: #fff;
  padding: 10px 20px;
  background: #e50914;
  border-radius: 5px;
  font-size: 1.1rem;
  text-align: center;
}

.btn-lg {
  text-decoration: none;
  color: #fff;
  padding: 10px 15px;
  margin: 0;
  background: #e50914;
  border-radius: 5px;
  font-size: 25px;
  text-align: center;
}

.btn-lg:hover {
  background: #fd1c27;
}

/* inner container title and text style */

.inner-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  line-height: 1.25;
}
.inner-title {
  font-size: 1.8rem;
  width: 90%;
}

.inner-title h1 {
  margin-bottom: 1rem;
}

.inner-text {
  font-size: 1.5rem;
  width: 90%;
}

/* email form */

.email-form {
  margin: 1rem;
}
.email-form .get-started {
  padding-top: 1rem;
  display: flex;
  height: 80%;
}

.email-form .get-started > input {
  border-radius: 2px 0 0 2px;
  border: 3px solid #333;
  padding-left: 10px;
  font-size: 1.1rem;
  outline: none;
  flex: 1;
}

.email-form .btn-lg {
  border-radius: 0 2px 2px 0;
}

/* header */
.header {
  height: 110vh;
  position: relative;
  background: url("https://assets.nflxext.com/ffe/siteui/vlv3/8ef88e03-6f89-4c75-ae51-f8da7d252358/6ac07e5f-07ca-4543-8540-f22edce8bb02/TW-en-20210208-popsignuptwoweeks-perspective_alpha_website_small.jpg")
    no-repeat center center/cover;
  box-shadow: inset 0 50px 300px #000, inset 0 -50px 300px #000;
  border-bottom: 10px #333 solid;
}

/* brightness and vignette effect*/
.overlay {
  height: 100%;
  width: 100%;
  background: #000;
  position: absolute;
  left: 0;
  top: 0;
  opacity: 0.4;
}

/* logo */

.logo {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  position: relative;
  z-index: 1;
}

.logo > img {
  width: 150px;
}

/* header text , input form and button*/

.header .inner-container {
  margin-top: 10rem;
}

.header .inner-title {
  width: 50%;
  text-align: center;
}

.header h1 {
  margin-bottom: 1rem;
}

.header .inner-text {
  width: 50%;
  text-align: center;
}

/* showcase 1 */

.showcase {
  border-bottom: 10px solid #333;
  padding: 2rem 0;
}
.showcase-container {
  display: flex;
  width: 85%;
  margin: auto;
}

.showcase-img {
  position: relative;
  z-index: 1;
}

.showcase-animation {
  position: absolute;
  left: 75px;
  top: 95px;
  z-index: -1;
}

/* showcase 2*/

.case2 {
  width: 90%;
}

.showcase-container.case2 > .showcase-img {
  margin: 1.2rem 0;
}

.downloading {
  background: #000;
  width: 60%;
  height: 125px;
  position: absolute;
  top: 335px;
  left: 125px;
  border: 5px solid #333;
  border-radius: 10px;
  padding: 0.7rem;
  display: flex;
}

.downloading > img {
  height: 100%;
}

.download-text {
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.download-text > p {
  color: #0066e3;
}

/* showcase 3*/

.case3 .showcase-animation {
  width: 395px;
  height: 225px;
  top: 50px;
  left: 120px;
}

/* faq list */
.faq {
  border-bottom: 10px solid #333;
}

.faq .inner-container {
  line-height: 1.5;
  margin: 2rem 0;
}

.faq .inner-title {
  text-align: center;
}
.faq h1 {
  margin-bottom: 5rem;
}

.faq h2 {
  display: flex;
  justify-content: space-between;
  padding: 1.5rem;
}

.faq ul {
  width: 60%;
  margin: auto;
}

.faq li {
  border-bottom: 5px solid #000;
  background: #333;
  cursor: pointer;
}

.faq li.show i {
  transform: rotate(45deg);
}

.faq li > p {
  padding: 1rem 0;
  border-top: 1px solid #000;
  padding: 1.5rem;
  font-size: 1.3rem;
  position: absolute;
  max-height: 0;
  visibility: hidden;
  transition: max-height 0.1s ease-in;
}

.faq .inner-text {
  margin-top: 2rem;
}

/* show list item */
.faq li.show p {
  max-height: 700px;
  position: relative;
  visibility: visible;
}

/* footer */

footer {
  color: #757575;
  margin: 3rem auto;
  width: 70%;
}

footer .links > * {
  margin-bottom: 20px;
}

footer p {
  margin-bottom: 2rem;
}

footer .links ul {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 1rem;
}

footer .language {
  padding: 1rem 0;
  font-weight: 700;
  cursor: pointer;
  width: 14%;
  border: 1px solid #333;
  border-radius: 0.2rem;
  font-family: inherit;
  padding: 1rem;
  position: relative;
}

footer .language:active {
  outline: 1px solid #fff;
  box-shadow: 0 0 0 2px #fff;
}

footer .dropdown-list {
  width: 100%;
}

footer .dropdown-list ul {
  display: none;
  position: absolute;
  background: #000;
  border: 1px solid #333;
  top: 58px;
  width: 100%;
  left: 0;
}

footer .dropdown-list li {
  margin: 0.5rem 0;
}

/* show dropdown item */
footer .dropdown-list ul.show {
  display: block;
}

/* large-screen*/

@media (max-width: 950px) {
  /* global setting */

  /* button */
  .btn-lg {
    padding: 10px 12.5px;
    font-size: 15px;
    text-align: center;
    margin: 10px auto;
  }

  /* text style */

  .inner-title {
    font-size: 1.6rem;
    text-align: center;
    width: 100%;
  }

  .inner-text {
    font-size: 1.2rem;
    width: 100%;
    text-align: center;
  }

  /* email form */
  .email-form .get-started {
    padding-top: 1rem;
    display: flex;
    flex-direction: column;
  }

  .email-form .get-started > input {
    padding: 1rem;
    font-size: 1.1rem;
  }

  /* nav logo */
  .logo > img {
    width: 120px;
  }

  /* header */
  .header {
    height: 100%;
  }

  .header .inner-title {
    width: 70%;
  }

  /* showcase */
  .showcase-container {
    flex-direction: column;
    width: 90%;
  }

  .showcase-img {
    display: flex;
    justify-content: center;
  }

  .showcase-animation {
    left: 180px;
    top: 95px;
    z-index: -1;
  }

  .case2 .showcase-img {
    order: 2;
  }

  .case3 .showcase-animation {
    top: 50px;
    left: 218px;
  }

  /* faq list */
  .faq ul {
    width: 90%;
    margin: auto;
  }

  .faq h2 {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    font-size: 1.2rem;
  }

  /* footer */
  footer {
    width: 90%;
  }

  footer .language {
    width: 20%;
  }
}

/* tablet-screen */
@media (max-width: 768px) {
  .header .inner-container {
    margin-top: 2rem;
  }

  .inner-title {
    width: 90%;
    font-size: 1.5rem;
  }

  .inner-text {
    width: 90%;
    font-size: 1.5rem;
  }
  .case1 .showcase-animation {
    left: 100px;
  }

  .case3 .showcase-animation {
    left: 135px;
  }
  /* button */

  .btn {
    padding: 10px 15px;
    font-size: 15px;
  }
}

/* median-screen*/
@media (max-width: 550px) {
  /* nav logo */

  .logo > img {
    width: 100px;
  }

  /* showcase*/
  .inner-text .get-started > input {
    padding: 0.5rem;
    font-size: 1.1rem;
  }
  .showcase-img {
    display: flex;
    justify-content: center;
  }

  .showcase-img > img {
    width: 100%;
  }

  .case1 .showcase-animation {
    width: 400px;
    left: 35px;
    top: 45px;
  }

  .case3 .showcase-animation {
    width: 300px;
    top: 0;
    left: 85px;
  }

  .downloading {
    top: 260px;
    left: 95px;
    height: 70px;
    border: 3px solid #333;
  }

  .download-text {
    font-size: 10px;
    padding-left: 15px;
  }

  /* faq list */
  .faq h1 {
    text-align: center;
    font-size: 25px;
    margin-bottom: 0.5rem;
  }

  .faq ul {
    width: 100%;
  }
  .faq li {
    font-size: 10px;
  }

  /* footer */
  footer .links ul {
    grid-template-columns: repeat(2, 1fr);
    grid-gap: 1rem;
  }
}

@media (max-width: 375px) {
  .inner-title {
    font-size: 1rem;
  }
  .inner-text {
    font-size: 1rem;
  }

  /* header */

  .header .inner-title {
    width: 90%;
  }
  .header .inner-text {
    width: 90%;
  }
  /* showcase */
  .case1 .showcase-animation {
    width: 250px;
    left: 45px;
    top: 50px;
  }

  .case3 .showcase-animation {
    width: 210px;
    left: 60px;
    top: -25px;
  }
  .downloading {
    top: 180px;
    left: 66px;
  }
}