index.css

/* resets */

body, header, div, h1, h3, button, a, ul, li, p, span {
  margin: 0;
  padding: 0;
  border: 0;
  outline: 0;
  font: inherit;
  color: inherit;
  text-align: inherit;
  text-decoration: inherit;
  vertical-align: inherit;
  box-sizing: inherit;
  background: transparent;
  font-family: 'Open Sans', sans-serif;
  border-radius: 0;
}

ul {
  list-style: none;
}

.group:after {
  content: "";
  clear: both;
  display: block;
}

img {
  display: block;
  width: 100%;
  height: auto;
}

/* head section */

.header {
  width: 100%;
  display: block;
  padding: 20px 0;
  border-bottom: 1px solid silver;
  max-height: 420px;
  color: #a23125;
}

.header-text-container
 {
  padding: 45px 10px 0 0;
  float: left;
  width: 45%;
  width: calc(50% - 10px);
  display: block;
  text-align: right;
}

.header-text {
  float: right;
  vertical-align: middle;
}

.header-text-container h1 {
  font-weight: bold;
  font-size: 60px;
}

.header-text-container h3 {
  width: 100%;
  font-style: italic;
  font-weight: 300;
  font-size: 24px;
  margin-bottom: 10px;
}

.header-text-container .button {
  font-weight: bold;
  background-color: #a23125;
  color: white;
  padding: 10px 20px;
  border-radius: 5px;
  box-shadow: 0 3px 0 0 #801003;
}

.header-text-container .button:hover {
  background-color: #801003;
}

.header-text-container .button:active {
  margin-top: 3px;
  box-shadow: none;
}



.header-image {
  float: left;
  width: 45%;
  width: calc(50% - 10px);
  display: block;
  padding-right: 10px;
}

.header-image img {
  height: 340px;
  width: auto;
  float: left;
}

/* news items */

.news {
}

.news ul {
  padding-bottom: 10px;
  width: 80%;
  padding-top: 10px;
  margin: 0 auto;
}

li.news-item {
  padding: 0 5px;
  height: 19px;
  float: left;
  display: block;
  width: 25%;
  width: calc(33% - 10px);
  overflow: hidden;
}

/* image boxes */

.img-boxes {
  margin-top: 20px;
}

.img-boxes ul {
  float: left;
  width: 48%;
  width: calc(50% - 5px);
  border-top: 1px solid #a23125;
}

.img-boxes h3 {
  text-align: center;
  padding-top: 10px;
  width: 100%;
  font-weight: bold;
  color: #a23125;
  font-size: 24px;
  margin-bottom: 10px;
}

ul.do-it-list {
  padding-right: 5px;
}

ul.customer-list {
  padding-left: 5px;
}

.img-boxes li {
  position: relative;
  float: left;
  width: 33.33%;
}

.img-boxes li a {
  height: 100%;
  width: 100%;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: linear-gradient(135deg, rgba(232,76,60,1) 0%,rgba(232,76,60,0.99) 1%,rgba(255,255,255,0.35) 65%,rgba(255,255,255,0) 100%);
  transition: background .3s ease-in;
}

.layer {
  display: block;
  height: 100%;
  width: 100%;
  background-color: rgba(40,43,48,0.45);
  transition: background .3s ease-in;
}

.img-boxes li a:hover{
  background: linear-gradient(135deg, rgba(255,255,255,0) 100%,rgba(255,255,255,0) 100%,rgba(232,76,60,0) 100%,rgba(232,76,60,1) 100%); /* W3C */
}

.img-boxes li a:hover .layer {
  background-color: rgba(40,43,48,0);
}
.img-boxes li a:hover .layer p{
  text-shadow: 0px 0px 10px black;
}

.layer p {
  text-align: center;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.img-text {
  position: absolute;
  z-index: 4;
  color: white;
  font-size: 21px;
  text-transform: uppercase;
  font-weight: 700;
}

@media (max-width: 900px) {
/*
  height of header image
  header and img 100% width
  remove floats
  font sizes

  news items set width to 100%
  remove line height/ overflow hidden

  img width 50%
  change col width 100% and remove padding

  change button styling
*/
  .header-text-container .button {
    background-color: #a23125;
    box-shadow: none;
  }

  .header-text-container .button:hover {
    background-color: #a23125;
  }

  .header-text-container .button:active {
    margin-top: 0;
    box-shadow: none;
  }

  .news ul {
    width: 100%
  }

  li.news-item {
    width: 100%;
    padding: 0;
    margin: 5px 0;
    height: auto;
    overflow: visible;
    text-align: center;
  }

  .img-boxes {
    margin-top: 0;
  }

  .img-boxes li {
    width: 50%;
  }
}

@media (max-width: 750px) {
  .header {
    padding-top: 0px;
  }

  .header-text-container {
    padding: 10px 0 20px 0;
    width: 100%;
    text-align: center;
  }

  .header-image {
    width: 100%;
    padding: 0;
    margin: 0 auto;
  }

  .header-text {
    float: none;
  }

  .header-image img {
    width: 100%;
    height: 170px;
    width: auto;
    position: relative;
    left: 50%;
    transform: translate(-50%, 0px);
  }

  .img-boxes ul {
    float: left;
    width: 100%;
    border-top: 1px solid #a23125;
  }

  ul.do-it-list {
    padding: 0;
  }

  ul.customer-list {
    padding: 0;
  }

  .img-boxes li {
    width: 33.33%;
  }
}

@media (max-width: 600px) {
  .img-boxes li {
    width: 50%;
  }
}