body {
    padding: 0;
    margin: 0;
    background: #f2f6e9;
  }
  /*--- navigation bar ---*/
    
    .overlay {
        position: absolute;
        min-height: 100%;
        min-width: 100%;
        left: 0;
        top: 0;
        background: rgba(0, 0, 0, 0.6);
    }
    .navbar {
        background:#6ab446;
    }
    .nav-link,
    .navbar-brand {
        color: #fff;
        cursor: pointer;
    }
    .nav-link {
        margin-right: 1em !important;
    }
    .nav-link:hover {
        color: #000;
    }
    .navbar-collapse {
        justify-content: flex-end;
    }

    .header {
        background-image: url('../images/night-landscape.jpg');
        background-size: cover;
        background-position: center;
        position: relative;
    }

    .description {
        left: 50%;
        position: absolute;
        top: 45%;
        transform: translate(-50%, -55%);
        text-align: center;
    }
    .description h1 {
        color: #6ab446;
    }
    .description p {
        color: #fff;
        font-size: 1.3rem;
        line-height: 1.5;
    }

    .description button {
        border:1px solid #6ab446;
        background:#6ab446;
        border-radius: 0;
        color:#fff;
    }
    .description button:hover {
        border:1px solid #fff;
        background:#fff;
        color:#000;
    }

    .features {
        margin: 4em auto;
        padding: 1em;
        position: relative;
    }
    .feature-title {
        color: #333;
        font-size: 1.3rem;
        font-weight: 700;
        margin-bottom: 20px;
        text-transform: uppercase;
    }
    .features img {
        -webkit-box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.4);
        -moz-box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.4);
        box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.4);
        margin-bottom: 16px;
    }

    .features .form-control,
    .features input {
        border-radius: 0;
    }
    .features .btn {
        background-color: #589b37;
        border: 1px solid #589b37;
        color: #fff;
        margin-top: 20px;
    }
    .features .btn:hover {
        background-color: #333;
        border: 1px solid #333;
    }

    .page-footer {
        background-color: #222;
        color: #ccc;
        padding: 60px 0 30px;
    }
    .footer-copyright {
        color: #666;
        padding: 40px 0;
    }

    @media (max-width: 575.98px) {
        .description {
        left: 0;
        padding: 0 15px;
        position: absolute;
        top: 10%;
        transform: none;
        text-align: center;
        }
        
        .description h1 {
        font-size: 2em;
        }
        
        .description p {
        font-size: 1.2rem;
        }
        
        .features {
        margin: 0;
        }
    }