stylesheet.css

* {
  box-sizing: border-box;
}

html,
body,
ul,
ol,
li,
h1,
h2,
h3,
h4,
h5,
h6,
p,
div {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Lucida Grande";
}

a {
  text-decoration: none;
}

.clear {
  clear: left;
}

.container {
  max-width: 1170px;
  padding: 0 15px;
  margin: 0 auto;
}

.top-wrapper {
  padding: 180px 0 100px 0;
  background-image: url(https://prog-8.com/images/html/advanced/top_en.png);
  background-size: cover;
  color: white;
  text-align: center;
}

.top-wrapper h1 {
  opacity: 0.7;
  font-size: 45px;
  letter-spacing: 5px;
  margin-bottom: 10px;
}

.top-wrapper p {
  opacity: 0.7;
  margin-bottom: 3px;
}

.btn-wrapper {
  text-align: center;
  margin: 20px 0;
}

.btn-wrapper p {
  margin: 10px 0;
}

.signup {
  background-color: #239b76;
}

.facebook {
  background-color: #3b5998;
  margin-right: 10px;
}

.twitter {
  background-color: #55acee;
}

.btn {
  padding: 12px 24px;
  color: white;
  display: inline-block;
  opacity: 0.8;
  border-radius: 4px;
  text-align: center;
}

.btn:hover {
  opacity: 1;
}

.fa {
  margin-right: 5px;
}

header {
  height: 65px;
  width: 100%;
  background-color: rgba(34, 49, 52, 0.9);
  position: fixed;
  top: 0;
  z-index: 10;
}

.logo {
  width: 124px;
  margin-top: 20px;
}

.header-left {
  float: left;
}

.header-right {
  float: right;
  margin-right: -25px;
}

.header-right a {
  line-height: 65px;
  padding: 0 25px;
  color: white;
  display: block;
  float: left;
  transition: all 0.5s;
}

.header-right a:hover {
  background-color: rgba(255, 255, 255, 0.3);
}

/* Modal  */
/* Modal is not visible by default. Modal become visible by changing the display property */
.signup-modal-wrapper {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-color: rgba(0, 0, 0, 0.6);
  z-index: 100;
  display: none;
}

.modal {
  position: absolute;
  top: 20%;
  left: 34%;
  background-color: #e6ecf0;
  padding: 20px 0 40px;
  border-radius: 10px;
  width: 450px;
  height: auto;
  text-align: center;
}

.fa-times {
  position: absolute;

  top: 12px;
  right: 12px;
  color: rgba(128, 128, 128, 0.46);
  cursor: pointer;
}

.fa-times:hover {
  color: #8491a5;
  background-color: #ccd9ea;
  transition: 0.3s ease-in-out;
}

#signup-form {
  width: 100%;
}

#signup-form h2 {
  color: #5f5d60;
  letter-spacing: 1px;
  margin-bottom: 40px;
}

#signup-form input {
  width: 320px;
  margin-bottom: 20px;
  font-size: 12px;
  padding: 12px 12px;
  border: 1px solid #d0d5d8;
  border-radius: 5px;
}

#submit-btn {
  display: inline-block;
  padding: 14px 140px;
  background-color: #5dca88;
  border: none;
  border-radius: 3px;
  color: white;
  margin: 10px auto;
  cursor: pointer;
}

.lesson-wrapper {
  padding-bottom: 80px;
  padding-left: 5%;
  padding-right: 5%;
  background-color: #f7f7f7;
  text-align: center;
}

.heading {
  padding-top: 80px;
  padding-bottom: 50px;
  color: #5f5d60;
}

.heading h2 {
  font-weight: normal;
}

.lesson {
  float: left;
  width: 25%;
}

.lesson-icon {
  position: relative;
}

.lesson-icon p {
  position: absolute;
  top: 44%;
  width: 100%;
  color: white;
}

.text-contents {
  width: 80%;
  display: inline-block;
  margin-top: 15px;
  font-size: 15px;
  color: #b3aeb5;
}

.heading h3 {
  font-weight: normal;
}

.message-wrapper {
  border-bottom: 1px solid #eee;
  padding-bottom: 80px;
  text-align: center;
}

.message {
  padding: 15px 40px;
  background-color: #5dca88;
  cursor: pointer;
  box-shadow: 0 7px #1a7940;
}

.message:active {
  position: relative;
  top: 7px;
  box-shadow: none;
}

footer img {
  width: 125px;
}

footer p {
  color: #b3aeb5;
  font-size: 12px;
}

footer {
  padding-top: 30px;
  padding-bottom: 20px;
}

.menu-icon {
  color: white;
  float: right;
  font-size: 25px;
  padding: 21px 0;
  display: none;
}