body {
  background: #f6fbfd;
  color: #0e1a2d;
  font-family: "Raleway", sans-serif;
  font-size: 21px;
  line-height: 1.25;
  font-weight: 300;
  margin: 0;
  padding: 0;
}
section {
  max-width: 760px;
  margin: 32px auto;
  text-align: center;
}
.hero {
  padding: 48px 0 16px;
  margin-top: 0;
  color: #fff;
  background: #0e1a2d url(back.png);
  background-attachment: fixed;
}
.hero section {
  margin-top: 0;
}
.hero .logo {
  height: 100px;
}
h1 {
  font-size: 2.5em;
  max-width: 600px;
  margin: 48px auto;
  line-height: 1.2;
}
h2 {
  font-size: 1.2em;
  font-weight: 400;
  max-width: 600px;
  margin: 48px auto;
  line-height: 1.4;
}
.underline {
  border-bottom: 2px solid #3498db;
  display: inline-block;
  padding: 2px 5px;
}
.hero .signup {
  max-width: 500px;
  margin: 0 auto;
}
.hero form {
  margin: 8px auto;
}

input {
  font-family: "Raleway", sans-serif;
  font-size: 1em;
  line-height: 2;
  border: none;
  border-radius: 5px;
  margin: 8px auto;
  outline: none;
  border: none;
  padding: 8px 16px;
}
input.field {
  background: #fff;
  border-bottom: 2px solid #cee0ec;
  min-width: 400px;
}
.button {
  cursor: pointer;
  background: #3498db;
  border-bottom: 2px solid #115d90;
  color: #fff;
  transition: background 0.5s;
  min-width: 100px;
}
.button:hover {
  background: #49aff3;
}
.feature {
  text-align: left;
  padding: 16px 0;
}
#inside .feature {
  padding: 32px 0;
}
.testimonial {
  padding: 64px 0;
  color: #6882ab;
}
.testimonial .avatar {
  border-radius: 50%;
  height: 60px;
  border: 2px solid #49aff3;
  margin-bottom: 8px;
}
.testimonial i {
  line-height: 1.6;
}
.testimonial .author {
  font-size: 0.85em;
}

#instructor {
  margin-top: 96px;
}
#instructor .avatar {
  position: relative;
  height: 150px;
  margin-bottom: -100px;
  top: -125px;
  left: calc(50% - 75px);
  border-radius: 50%;
  border: 5px solid #fff;
}

a {
  text-decoration: none;
  color: inherit;
  border-bottom: 2px solid #3498db;
}
.hero a {
  color: #fff;
}

.details {
  font-size: 0.8em;
  padding-top: 8px;
  color: #ddd;
  line-height: 1;
}

@media only screen and (max-width: 600px) {
  body {
    font-size: 16px;
  }
  section {
    width: 90%;
  }
  input.field {
    min-width: 250px;
  }
  input.button {
    min-width: 250px;
  }
}