html {
    scroll-padding-top: calc(4.5rem - 1px);
  }
  
  body {
    letter-spacing: 0.0625em;
  }
  
  #mainNav {
    min-height: 3.5rem;
    background-color: #fff;
  }
  #mainNav .navbar-toggler {
    font-size: 80%;
    padding: 0.75rem;
    color: #64a19d;
    border: 1px solid #64a19d;
  }
  #mainNav .navbar-toggler:focus {
    outline: none;
  }
  #mainNav .navbar-brand {
    color: #000;
    font-weight: 700;
    padding: 0.9rem 0;
  }
  #mainNav .navbar-nav .nav-item:hover {
    color: fade(#fff, 80%);
    outline: none;
    background-color: transparent;
  }
  #mainNav .navbar-nav .nav-item:active, #mainNav .navbar-nav .nav-item:focus {
    outline: none;
    background-color: transparent;
  }
  @media (min-width: 992px) {
    #mainNav {
      padding-top: 0;
      padding-bottom: 0;
      border-bottom: none;
      background-color: transparent;
      transition: background-color 0.3s ease-in-out;
    }
    #mainNav .navbar-brand {
      padding: 0.5rem 0;
      color: rgba(255, 255, 255, 0.5);
    }
    #mainNav .nav-link {
      transition: none;
      padding: 2rem 1.5rem;
      color: rgba(255, 255, 255, 0.5);
    }
    #mainNav .nav-link:hover {
      color: rgba(255, 255, 255, 0.75);
    }
    #mainNav .nav-link:active {
      color: #fff;
    }
    #mainNav.navbar-shrink {
      background-color: #fff;
    }
    #mainNav.navbar-shrink .navbar-brand {
      color: #000;
    }
    #mainNav.navbar-shrink .nav-link {
      color: #000;
      padding: 1.5rem 1.5rem 1.25rem;
      border-bottom: 0.25rem solid transparent;
    }
    #mainNav.navbar-shrink .nav-link:hover {
      color: #64a19d;
    }
    #mainNav.navbar-shrink .nav-link:active {
      color: #467370;
    }
    #mainNav.navbar-shrink .nav-link.active {
      color: #64a19d;
      outline: none;
      border-bottom: 0.25rem solid #64a19d;
    }
  }
  
  .btn {
    box-shadow: 0 0.1875rem 0.1875rem 0 rgba(0, 0, 0, 0.1) !important;
    padding: 1.25rem 2rem;
    font-size: 80%;
    text-transform: uppercase;
    letter-spacing: 0.15rem;
    border: 0;
  }
  
  .masthead {
    position: relative;
    width: 100%;
    height: auto;
    min-height: 35rem;
    padding: 15rem 0;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.7) 75%, #000 100%), url("../assets/img/leonard-cotte-0PqjcsYiPfU-unsplash-green.jpg");
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: scroll;
    background-size: cover;
  }
  .masthead h1, .masthead .h1 {
    font-size: 2.5rem;
    line-height: 2.5rem;
    letter-spacing: 0.8rem;
    background: linear-gradient(rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0));
    -webkit-text-fill-color: transparent;
    -webkit-background-clip: text;
            background-clip: text;
  }
  .masthead h2, .masthead .h2 {
    max-width: 20rem;
    font-size: 1rem;
  }
  @media (min-width: 768px) {
    .masthead h1, .masthead .h1 {
      font-size: 4rem;
      line-height: 4rem;
    }
  }
  @media (min-width: 992px) {
    .masthead {
      height: 100vh;
      padding: 0;
    }
    .masthead h1, .masthead .h1 {
      font-size: 6.5rem;
      line-height: 6.5rem;
      letter-spacing: 0.8rem;
    }
    .masthead h2, .masthead .h2 {
      max-width: 30rem;
      font-size: 1.25rem;
    }
  }
  
  .about-section {
    padding-top: 5rem;
    background: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.9) 75%, rgba(0, 0, 0, 0.8) 100%);
  }
  .about-section p {
    margin-bottom: 5rem;
  }
  
  .projects-section {
    padding: 10rem 0;
  }
  .projects-section .featured-text {
    padding: 2rem;
  }
  @media (min-width: 992px) {
    .projects-section .featured-text {
      padding: 0 0 0 2rem;
      border-left: 0.5rem solid #64a19d;
    }
  }
  .projects-section .project-text {
    padding: 3rem;
    font-size: 90%;
  }
  @media (min-width: 992px) {
    .projects-section .project-text {
      padding: 5rem;
    }
  }
  
  .signup-section {
    padding: 10rem 0;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.1) 0%, rgba(0, 0, 0, 0.5) 75%, #000 100%), url("../assets/img/bg-footer2.jpg");
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: scroll;
    background-size: cover;
  }
  .signup-section .form-signup input {
    box-shadow: 0 0.1875rem 0.1875rem 0 rgba(0, 0, 0, 0.1) !important;
    padding: 1.25rem 2rem;
    height: auto;
    font-family: "Varela Round", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    font-size: 80%;
    text-transform: uppercase;
    letter-spacing: 0.15rem;
    border: 0;
  }
  
  .contact-section {
    padding-top: 5rem;
  }
  .contact-section .card {
    border: 0;
    border-bottom: 0.25rem solid #64a19d;
  }
  .contact-section .card h4, .contact-section .card .h4 {
    font-size: 0.8rem;
    font-family: "Varela Round", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    text-transform: uppercase;
    letter-spacing: 0.15rem;
  }
  .contact-section .card hr {
    opacity: 1;
    border-color: #64a19d;
    border-width: 0.25rem;
    width: 3rem;
  }
  .contact-section .social {
    margin-top: 5rem;
  }
  .contact-section .social a {
    text-align: center;
    height: 3rem;
    width: 3rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 100%;
    line-height: 3rem;
    color: rgba(255, 255, 255, 0.3);
  }
  .contact-section .social a:hover {
    color: rgba(255, 255, 255, 0.5);
  }
  .contact-section .social a:active {
    color: #fff;
  }
  
  .mapframe {
    position: relative;
    overflow: hidden;
    width: 100%;
    padding-top: 56.25%; /* 16:9 Aspect Ratio (divide 9 by 16 = 0.5625) */
  }

  .responsive-iframe {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    width: 100%;
    height: 100%;
  }

  .svg {
    fill: red;
    color: purple;
  }

  .footer {
    padding: 5rem 0;
  }