index.css

@import url('https://fonts.googleapis.com/css?family=Raleway:300,400,700,900');

/* General Styling */

* {
  box-sizing: border-box;
  transition: all ease-in-out 700ms;
}

body {
  margin: 0;
  font-family: Raleway, sans-serif;
  text-align: center;
}

img {
  max-width: 100%;
  height: auto;
}

.container {
  width: 95%;
  margin: 0 auto
}

h1 {
  font-weight: 900;
  font-size: 2.5rem;
}

.clearfix:after,
section:after,
footer::after {
  content: '';
  display: block;
  clear: both;
}

[class^=col-] {
    width: 100%;
    float: left;
}

@media (min-width: 28rem) {
  .col-1 {
    width: 33.333334%;
    float: left;
  }
}

@media (min-width: 60rem) {

  .col-3 {
    width: 50%;
    padding-right: 2em;
  }

  .col-1 {
    width: 16.666%;
  }
}

/* Typography */

.title span {
  font-weight: 300;
  display: block;
  font-size: .9em;
}

@media (min-width: 50em) {
  .title { font-size: 3.5rem; }
}

/* Buttons */

.button {
  display: inline-block;
  font-size: 1.2rem;
  text-decoration: none;
  text-transform: uppercase;
  border: 2px solid;
  padding: .5em 1.75em;
}

@media (min-width: 50rem) {
  .button {
    font-size: 1.5rem;
  }
}

.button-accent {
  color: #00ff6c;
  border-color: #00ff6c;
}

.button-accent:hover,
.button-accent:focus {
  background-color: #00ff6c;
  color: #fff;
}

.button-small {
  font-size: .8em;
}

.button-dark {
  color: black;
  font-weight: 700;
}

.button-dark:hover,
.button-dark:focus {
  background-color: black;
  color: #00ff6c
}

/* Header Style */

header {
  margin: 2em;
  position: absolute;
  left: 0;
  right: 0;
}

nav ul {
  margin: 15px 0 0;
  padding: 0;
  list-style: none;
}

nav li {
  display: inline-block;
  margin: .65em;
}

nav a {
  font-weight: 700;
  padding: .5em;
  text-decoration: none;
  text-transform: uppercase;
  font-size: .8rem;
  color: #fff;
}

nav a:hover,
nav a:focus {
  color: #00ff6c;
}

@media (min-width: 50rem) {
  .logo { float: left; }
  nav { float: right; }
  nav a { font-size: 1rem; }
}

/* Hero Styles */

.home-hero {
  background: url('img/hero-bg.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed; /* Adds parallax scrolling effect*/
  padding: 10em 0;
  color: #fff;
}

@media (min-width: 50rem) {
  .home-hero {
    height: 100vh;
    padding-top: 30vh;
  }
}

/* Home About Style */

.home-about-textbox {
  background-color: #232323;
  padding: 4em;
  width: 100vw;
  margin-left: -2.5%;
  outline: 2px solid #00ff6c;
  outline-offset: -2.5em;
  color: #fff;
  position: relative;
  text-align: left;
  background-attachment: scroll;
}

.home-about-textbox h2 {
  background-color: #232323;
  color: #00ff6c;
  font-weight: 400;
  text-transform: uppercase;
  position: absolute;
  top: .4em;
  left: 50%;
  transform: translateX(-50%);
  padding: 0 .5em;
  font-size: 1.3rem;
}

@media (min-width: 25rem) {
  .home-about-textbox h2 {
    font-size: 1.775rem;
    padding: 0 5px;
    top: -3px;
  }
}

@media (min-width: 70rem) {
  .home-about {
    background-image: url('img/who-we-are.jpg');
    background-repeat: no-repeat;
    background-size: cover;
    padding-bottom: 15em;
    margin: 0 3em;
  }

  .home-about-textbox {
    width: 40%;
    height: 80vh;
    padding: 4em;
    bottom: 5em;
    left: -2px;
    box-shadow: 0 0 5em 0 rgba(0,0,0,0.5);
  }

  .home-about-textbox h2 {
    font-size: 1.76rem;
  }

  .home-about-textbox > p {
    line-height: 1.5;
    font-size: 1.2rem;
  }
}

hr {
  margin-top: 3em;
  width: 6em;
  height: 3px;
  background-color: #00ff6c;
  border: 0;
}

/* Portfolio Style */

.portfolio {
  margin: 3em 0 0;
}

.portfolio h2 {
  font-size: 1.5rem;
  font-weight: 400;
  text-transform: uppercase;
}

.port-item {
  margin: 0;
  position: relative;
}

.port-item img {
  display: block;
}

.port-desc {
  position: absolute;
  z-index: 100;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,.6);
  color: white;
  padding-bottom: 1em;
  opacity: 0;
}

.port-item:hover .port-desc {
  opacity: 1;
}

@media (min-width: 38rem) {
  .port-item {
    width: 50%;
    float: left;
  }
}

@media (min-width: 60rem) {
  .port-item {
    width: 33.333334%;
  }
}

/* Call To Action Style */

.cta {
  background-color: #00ff6c;
  padding: 2.5em 0;
}

.cta .title {
  margin-bottom: 15px;
}

/* Footer Style */

footer {
  background-color: black;
  color: white;
  text-align: left;
  padding: 3em;
}

.unstyled-list {
  list-style: none;
  line-height: 2;
  padding-left: 0;
}