body {
    font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
    font-size: 18px;
    line-height: 34px;
    color: #777777;
    background: url("./images/concrete_seamless.png");
  }
  
  * {
    box-sizing: border-box;
  }
  
  /* general */
  
  .container {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    clear: both;
  }
  
  h1,
  h2,
  h3,
  p {
    margin-bottom: 20px;
  }
  
  p:last-child {
    margin-bottom: 0;
  }
  
  h1,
  h2,
  h3 {
    font-family: Georgia, Times, "Times New Roman", serif;
    font-weight: 700;
    color: #4aaaa5;
  }
  
  h1 {
    padding-bottom: 20px;
    font-size: 30px;
    line-height: 49px;
    border-bottom: 3px solid #dddddd;
  }
  
  h2,
  h3 {
    font-size: 22px;
  }
  
  /* header */
  
  #masthead {
    position: fixed;
    z-index: 99;
    width: 100%;
    margin: 0 0 30px;
    overflow: auto;
    color: #ffffff;
    background: #ffffff;
    border-bottom: 2px solid #cccccc;
  }
  
  #logo {
    float: left;
    width: 400px;
    height: 90px;
    font-family: Georgia, Times, "Times New Roman", serif;
    font-size: 30px;
    font-weight: 700;
    line-height: 90px;
    color: #ffffff;
    text-align: center;
    text-decoration: none;
    background: #4aaaa5;
  }
  
  nav {
    float: right;
    margin-top: 25px;
  }
  
  nav a {
    display: inline-block;
    padding-left: 15px;
    margin-left: 15px;
    line-height: 18px;
    color: #999;
    text-decoration: none;
    border-left: 1px solid #efefef;
  }
  
  nav a:first-child {
    border-left: 0 none;
  }
  
  /* footer */
  
  footer {
    background: #666666;
    color: #ffffff;
    padding: 30px 0;
    clear: both;
    border-top: 8px solid #4aaaa5;
    color: #cccccc;
    font-size: 14px;
    text-align: center;
  }
  
  h3, h2 {
    padding-bottom: 20px;
    margin-bottom: 15px;
    line-height: 22px;
    border-bottom: 2px solid #eeeeee;
  }
  
  /* main */
  
  #main-container {
    padding-top: 130px;
    min-height: calc(100vh - 70px);
  }
  
  .main-section {
    float: left;
    width: 100%;
    max-width: 960px;
    padding: 30px;
    margin: 0 0 40px;
    background: #ffffff;
    border: 1px solid #dddddd;
  }
  
  /* portfolio page */
  
  .work {
    position: relative;
    float: left;
    width: 274px;
    margin: 20px 0 25px;
    overflow: auto;
  }
  
  .work:nth-child(even) {
    margin-right: 40px;
  }
  
  .work img {
    width: 100%;
    border: 0 none;
    opacity: 0.8;
  }
  
  .work h3 {
    position: absolute;
    bottom: 20px;
    width: 100%;
    padding: 15px;
    margin-bottom: 0;
    font-weight: 300;
    line-height: 30px;
    color: #ffffff;
    text-align: center;
    background: #4aaaa5;
    border-bottom: 0;
  }
  
  .auth-image {
    float: left;
    width: 200px;
    height: auto;
    margin-top: 10px;
    margin-right: 25px;
  }
  
  /* contact page */
  
  #contact-form ul {
    margin-bottom: 20px;
  }
  
  #contact-form li {
    margin-bottom: 10px;
  }
  
  label,
  input[type=text],
  input[type=email],
  textarea {
    display: block;
    width: 100%;
  }
  
  input[type=text],
  input[type=email],
  textarea {
    height: 35px;
    padding: 0 10px;
    font-size: 14px;
    border: 1px solid #dddddd;
  }
  
  textarea {
    height: 200px;
  }
  
  input[type=submit] {
    padding: 10px 30px;
    font-size: 18px;
    color: #ffffff;
    cursor: pointer;
    background: #4aaaa5;
    border: 0 none;
  }


  a:hover {
    color: #4aaaa5;
    text-decoration: underline
 }
 
 
 a {
    color: #4aaaa5;
 }

 
  
/* target viewport sizes less than 640px */
@media screen (max-width: 640px) {
  header {
    text-align: center;
    margin-bottom: 2.5rem;
  }
  .logo {
    margin-bottom: 0;
  }
  nav a {
    padding: 6px 0;
    background: #4aaaa5;
    text-align: center;
    margin: .2em 0;
  }
}


/* target viewport sizes 640px and wider */
@media screen (min-width: 640px) {
  .logo {
    float: left;
  }
  nav {
    margin-top: 24px;
  }
  nav li {
    display: inline-block;
    margin: 0 0 .45em;
  }
  h1, h2, h3 {
margin-bottom: 1.5em;
  }
}

/* target a viewport range wider than 640px and narrower than 768px */
@media screen (min-width: 640px) and (max-width: 768px) {
  nav {
    float: left;
    margin-left: 20px;
  }
}

/* target viewport sizes 768px and wider */
@media screen (min-width: 768px) {
  .articles {
    float: right;
    width: 65%;
  }
}

/* target viewport sizes 980px and wider */
@media screen (min-width: 980px) {
  nav {
    float: right;
  }
}