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

* {
  margin: 0;
  padding: 0;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

.header_sources {
  height: 100vh;
  width: 100%;
  padding: 0 8%;
  /* background: #080008; */
  position: relative;
  background-image: url(../img/resources.jpeg);
  background-size: cover;
}

h1 {
  font-size: 2.5rem;
  font-family: "Montserrat";
  font-weight: normal;
  color: #444;
  text-align: center;
  margin: 2rem 0;
}

.wrapper {
  width: 100%;
  margin: 0 auto;
  max-width: 80rem;
}

.cols {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
}

.col {
  width: calc(25% - 2rem);
  margin: 1rem;
  cursor: pointer;
}

.container {
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  -webkit-perspective: 1000px;
  perspective: 1000px;
}

.front,
.back {
  background-size: cover;
  box-shadow: 0 8px 16px 0 ;
  border-radius: 10px;
  background-position: center;
  -webkit-transition: -webkit-transform 0.7s cubic-bezier(0.4, 0.2, 0.2, 1);
  transition: -webkit-transform 0.7s cubic-bezier(0.4, 0.2, 0.2, 1);
  -o-transition: transform 0.7s cubic-bezier(0.4, 0.2, 0.2, 1);
  transition: transform 0.7s cubic-bezier(0.4, 0.2, 0.2, 1);
  transition: transform 0.7s cubic-bezier(0.4, 0.2, 0.2, 1),
    -webkit-transform 0.7s cubic-bezier(0.4, 0.2, 0.2, 1);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  text-align: center;
  min-height: 280px;
  height: auto;
  border-radius: 10px;
  color: #fff;
  font-size: 1.5rem;
}

.back {
  background: #cedce7;
  background: -webkit-linear-gradient(45deg, #cedce7 0%, #596a72 100%);
  background: -o-linear-gradient(45deg, #cedce7 0%, #596a72 100%);
  background: linear-gradient(45deg, #cedce7 0%, #596a72 100%);
}

.front:after {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  content: "";
  display: block;
  opacity: 0.6;
  background-color: #000;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: 10px;
}
.container:hover .front,
.container:hover .back {
  -webkit-transition: -webkit-transform 0.7s cubic-bezier(0.4, 0.2, 0.2, 1);
  transition: -webkit-transform 0.7s cubic-bezier(0.4, 0.2, 0.2, 1);
  -o-transition: transform 0.7s cubic-bezier(0.4, 0.2, 0.2, 1);
  transition: transform 0.7s cubic-bezier(0.4, 0.2, 0.2, 1);
  transition: transform 0.7s cubic-bezier(0.4, 0.2, 0.2, 1),
    -webkit-transform 0.7s cubic-bezier(0.4, 0.2, 0.2, 1);
}

.back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
}

.inner {
  -webkit-transform: translateY(-50%) translateZ(60px) scale(0.94);
  transform: translateY(-50%) translateZ(60px) scale(0.94);
  top: 50%;
  position: absolute;
  left: 0;
  width: 100%;
  padding: 2rem;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  outline: 1px solid transparent;
  -webkit-perspective: inherit;
  perspective: inherit;
  z-index: 2;
}

.container .back {
  -webkit-transform: rotateY(180deg);
  transform: rotateY(180deg);
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
}

.container .front {
  -webkit-transform: rotateY(0deg);
  transform: rotateY(0deg);
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
}

.container:hover .back {
  -webkit-transform: rotateY(0deg);
  transform: rotateY(0deg);
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
}

.container:hover .front {
  -webkit-transform: rotateY(-180deg);
  transform: rotateY(-180deg);
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
}

.front .inner p {
  font-size: 2rem;
  margin-bottom: 2rem;
  position: relative;
}

.front .inner p:after {
  content: "";
  width: 4rem;
  height: 2px;
  position: absolute;
  background: #c6d4df;
  display: block;
  left: 0;
  right: 0;
  margin: 0 auto;
  bottom: -0.75rem;
}

.front .inner span {
  color: rgba(255, 255, 255, 0.7);
  font-family: "Montserrat";
  font-weight: 300;
}

@media screen and (max-width: 64rem) {
  .col {
    width: calc(33.333333% - 2rem);
  }
}

@media screen and (max-width: 48rem) {
  .col {
    width: calc(50% - 2rem);
  }
}

@media screen and (max-width: 32rem) {
  .col {
    width: 100%;
    margin: 0 0 2rem 0;
  }
}