styles.css

@font-face {
  font-family: SourceSansProRegular;
  src: url(fonts/SourceSansPro-Regular.ttf);
}

@font-face {
  font-family: SourceSansProBold;
  src: url(fonts/SourceSansPro-Bold.ttf);
}

html {
  font-family: SourceSansProRegular, Helvetica, sans-serif;
  color: #666;
}

body {
  margin: 0;
  padding: 0;
}

.label {
  text-transform: uppercase;
  font-size: 11px;
  margin-bottom: 8px;
  color: #9d9d9d;
  font-family: SourceSansProBold;
}

.nav {
  background-color: #f1f1f1;
}

.header {
  color: #9d9d9d;
  font-size: 20px;
  font-weight: 500;
  padding-top: 15px;
  padding-bottom: 15px;
  padding-left: 60px;
}

.content {
  padding-left: 60px;
  padding-top: 2px;
}

input[type=text], 
textarea {
  font-family: SourceSansProRegular;
  width: 60%;
  display: block;
  height: auto;
  line-height: normal;
  font-size: 1em;
  border-radius: 8px;
  border: 3px solid transparent;
  margin: -4px;
  color: #666;
  padding: 8px 10px 9px;
  box-shadow: inset 0 0 1px 1px #d0d0d0;
  transition: border-color .2s ease-in;
}

input[type=text]:focus,
textarea:focus {
  border-color: rgba(62,170,175,.2);
  outline: 0;
  color: #666;
}

input[type=submit] {
  display: inline-block;
  padding: .7em .8rem;
  cursor: pointer;
  white-space: nowrap;
  border-radius: 2px;
  vertical-align: middle;
  line-height: 1;
  text-decoration: none;
  font-size: 14px;
  border: none;
  color: #fff;
  background-color: #2eb459;
  margin-top: 10px;
}

input[type=submit]:hover {
  background-color: #39aa56;
}

@media screen and (max-width: 768px) {
  .content {
    padding-left: 20px;
    padding-right: 20px;
    padding-top: 15px;
  }

  .header {
    padding-left: 20px;
  }

  input[type=text], 
  textarea {
    width: 100%; 
  }
}