@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,700);

body {
  background: #B1A7A0;
  color: #FCF9F4;
  font-family: "Open Sans", "Arial";
}
main {
  max-width: 800px;
  margin: 30px auto;
  padding: 30px;
}
input[name=css-tabs] {
  display: none;
}
a {
  color: #F29A77;
}
#tabs {
  padding: 0 0 0 50px;
  width: calc(100% + 50px);
  margin-left: -50px;
  background: #2B2A28;
  height: 80px;
  border-bottom: 5px solid #EB4E01;
  box-shadow: 0 3px 5px rgba(0,0,0,0.2);
}
#tabs::before {
  content: "";
  display: block;
  position: absolute;
  z-index: -100;
  width: 100%;
  left: 0;
  margin-top: 16px;
  height: 80px;
  background: #2B2A28;
  border-bottom: 5px solid #EB4E01;
}
#tabs::after {
  content: "";
  display: block;
  position: absolute;
  z-index: 0;
  height: 80px;
  width: 102px;
  background: #EB4E01;
  transition: transform 400ms;
}
#tabs label {
  position: relative;
  z-index: 100;
  display: block;
  float: left;
  font-size: 11px;
  text-transform: uppercase;
  text-align: center;
  width: 100px;
  height: 100%;
  border-right: 1px dotted #575654;
  cursor: pointer;
}
#tabs label:first-child {
  border-left: 1px dotted #575654;
}
#tabs label::before {
  content: "";
  display: block;
  height: 30px;
  width: 30px;
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
  filter: invert(40%);
  margin: 10px auto;
}
#tab1::before {
  background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/106891/paper-plane.png);
}
#tab2::before {
  background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/106891/big-cloud.png);
}
#tab3::before {
  background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/106891/folding-brochure.png);
}
#tab4::before {
  background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/106891/mans-silhouette.png);
}
#radio1:checked ~ #tabs #tab1::before, #radio2:checked ~ #tabs #tab2::before, #radio3:checked ~ #tabs #tab3::before, #radio4:checked ~ #tabs #tab4::before {
  filter: invert(100%);
}
#radio1:checked ~ #tabs::after {
  transform: translateX(0);
}
#radio2:checked ~ #tabs::after {
  transform: translateX(101px);
}
#radio3:checked ~ #tabs::after {
  transform: translateX(202px);
}
#radio4:checked ~ #tabs::after {
  transform: translateX(303px);
}
#content {
  position: relative;
  height: 500px;
}
#content::before {
  content: "";
  display: block;
  position: absolute;
  width: 0;
  height: 0;
  margin-left: -50px;
  border-top: 8px solid #000;
  border-right: 10px solid #000;
  border-left: 10px solid transparent;
  border-bottom: 8px solid transparent;
}
#content::after {
  content: "";
  display: block;
  position: absolute;
  width: 0;
  height: 0;
  margin-left: calc(100% + 30px);
  border-top: 8px solid #000;
  border-left: 10px solid #000;
  border-right: 10px solid transparent;
  border-bottom: 8px solid transparent;
}
#content section {
  position: absolute;
  transform: translateY(50px);
  opacity: 0;
  transition: transform 500ms, opacity 500ms;
}
#radio1:checked ~ #content #content1, #radio2:checked ~ #content #content2, #radio3:checked ~ #content #content3, #radio4:checked ~ #content #content4 {
  transform: translateY(0);
  opacity: 1;
}
footer {
  position: fixed;
  bottom: 0;
  right: 0;
  font-size: 13px;
  background: #555;
  padding: 5px 10px;
  margin: 5px;
}