style.css

*, ::after, ::before {
  padding: 0;
  margin: 0;
  box-sizing: border-box;

}
html {
  font: 10px 'Roboto', sans-serif;  
}
body {
  height: 100vh;
  font: 1.8rem 'Roboto', sans-serif;
  line-height: 1.5;
}
ul,li {
  list-style-type: none;
}
a {
  text-decoration: none;
  color: unset;
}
.padding8 {
  padding: 0.8rem;
}
.padding816 {
  padding: 0.8rem 1.6rem;
}
.padding16 {
  padding: 1.6rem;
}
.padding1632 {
  padding: 1.6rem 3.2rem;
}
.padding24 {
  padding: 2.4rem;
}
.margin8 {
  margin: 0.8rem;
}
.margin816 {
  margin: 0.8rem 1.6rem;
}
.margin16 {
  margin: 1.6rem;
}
.margin1632 {
  margin: 1.6rem 3.2rem;
}
.margin24 {
  margin: 2.4rem;
}
.center {
  display: flex;
  align-items: center;
  justify-content: center;
}
.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.col {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.b {
  font-weight: 700;
}
.b-super {
  font-weight: 900;
}
.t {
  font-weight: 200;
}
.i {
  font-style: italic;
}
.dark-bg {
  background-color: #1f2937;
}
.gray-bg {
  background-color: #e5e7eb;
}
.blue-bg {
  background-color: #3882f6;
}
.dark-txt {
  color: #1f2937;
}
.gray-txt {
  color: #e5e7eb;
}
.white-txt {
  color: #f9faf8;
}
.font18 {
  font-size: 1.8rem;
}
.font24 {
  font-size: 2.4rem;
}
.font36 {
  font-size: 3.6rem;
}
.font48 {
  font-size: 4.8rem;
}
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;

  padding: 0 10rem;
}
.header-fixed  {
  padding: 2rem;
  width: 100%;
  max-width: 100rem;
}
.nav-links {
  gap: 2rem;
}
/* section-1 */
.section-1 {
  margin: 6.4rem 0 0;
  padding: 4.8rem 10rem;
}
.sign-up-btn , .sign-up-btn-1{
  border: none;
  border-radius: 0.8rem;
}
.content-ctn {
  justify-content: space-between;
  gap: 2rem ;
  padding: 2rem;
  width: 100%;
  max-width: 100rem;
}
.article-1, .img-ctn {
  flex: 1;
}
/* section 2 */
.section-2 {
  padding: 2rem;
  width: 100%;
  max-width: 100rem;
  text-align: center;
  margin: 0 auto;
}
.article-2 {
  gap: 2.4rem;
}
.card {
  flex: 1 0 15rem;
}
.img-card-ctn {
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 3px solid rgb(90, 90, 145);
  border-radius: 8px;
}
/* section 3 */
.section-3 {
  padding: 6rem 2rem;
}
.article-3 {
  width: 100%;
  max-width: 80rem;
  margin: 0 auto;
}
.article-3 p:last-of-type {
  align-self: flex-end;
}
/* section 4 */
.section-4 {
  padding: 4rem 6rem;
}
.article-4 {
  width: 100%;
  max-width: 100rem;
  margin: 0 auto;
  padding: 3.2rem 6.4rem;
  border-radius: 8px;
}
.sign-up-btn-1 {
  border: 1px solid white !important;
}
/* responsive  */
@media (max-width: 500px) {
  html {
    font-size: 6px;
  }
  .font48 {
    font-size: 3rem;
  }
}
@media (max-width: 900px) {
  html {
    font-size: 8px;
  }
  .font48 {
    font-size: 3.6rem;
  }
}