@-webkit-keyframes scroll {
  0% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
  100% {
    -webkit-transform: translateX(calc(-500px * 9));
            transform: translateX(calc(-500px * 9));
  }
}

@keyframes scroll {
  0% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
  100% {
    -webkit-transform: translateX(calc(-500px * 9));
            transform: translateX(calc(-500px * 9));
  }
}
.slider {
  background:#333439;
  box-shadow: 0 10px 20px -5px rgba(0, 0, 0, 0.125);
  height: 200px;
  margin: auto;
  overflow: scroll;
  position: relative;
  width: 1080px;
}
.slider::before, .slider::after {
  background: linear-gradient(to right, #333439 0%, rgba(255, 255, 255, 0) 100%);
  content: "";
  height: 200px;
  position: absolute;
  width: 200px;
  z-index: 2;
}
.slider::after {
  right: 0;
  top: 0;
  -webkit-transform: rotateZ(180deg);
          transform: rotateZ(180deg);
}
.slider::before {
  left: 0;
  top: 0;
}
.slider .slide-track {
  -webkit-animation: scroll 20s linear infinite;
          animation: scroll 20s linear infinite;
  display: flex;
  width: calc(500px * 14);
}
.slider .slide {
  height: 200px;
  width: 500px;
}



.photos {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: flex-start;
  align-content: stretch;
  padding: 0;
  max-width: 1920px;
}

.photos img {
  display: block;
  float: left;
  flex: 0 0 auto;
}


@media screen and (min-width: 1024px) {
  .photos img {
    width: calc(100%/6);
    height: calc(100%/6);
  }
}

@media screen and (min-width: 769px) and (max-width: 1024px) {
  .photos img {
    width: calc(100%/4);
    height: calc(100%/4);
  }
}

@media screen and (min-width: 481px) and (max-width: 768px) {
  .photos img {
    width: calc(100%/3);
    height: calc(100%/3);
  }
}

@media screen and (min-width: 321px) and (max-width: 480px) {
  .photos img {
    width: calc(100%/2);
    height: calc(100%/2);
  }
}

@media screen  and (max-width: 320px) {
  .photos img {
    width: 100%;
    height: 100%;
  }
}

.scroll-down {
  opacity: 1;
  -webkit-transition: all .5s ease-in 3s;
  transition: all .5s ease-in 3s;
}

.scroll-down {
  position: absolute;
  bottom: 0px;
  top:100px;
  left: 50%;
  margin-left: -16px;
  display: block;
  width: 52px;
  height: 52px;
  border: 2px solid #FFF;
  background-size: 14px auto;
  border-radius: 50%;
  z-index: 2;
  -webkit-animation: bounce 2s infinite 2s;
  animation: bounce 2s infinite 2s;
  -webkit-transition: all .2s ease-in;
  transition: all .2s ease-in;
  transform: scale(1);
}

.scroll-down:before {
    position: absolute;
    top: calc(50% - 8px);
    left: calc(50% - 6px);
    transform: rotate(-45deg);
    display: block;
    width: 12px;
    height: 12px;
    content: "";
    border: 2px solid white;
    border-width: 0px 0 2px 2px;
}

@keyframes bounce {
  0%,
  100%,
  20%,
  50%,
  80% {
    -webkit-transform: translateY(0);
    -ms-transform: translateY(0);
    transform: translateY(0);
  }
  40% {
    -webkit-transform: translateY(-10px);
    -ms-transform: translateY(-10px);
    transform: translateY(-10px);
  }
  60% {
    -webkit-transform: translateY(-5px);
    -ms-transform: translateY(-5px);
    transform: translateY(-5px);
  }
}



.imgvideo {
  cursor: pointer;
}

.playbutton {
  background: url(https://cdn0.iconfinder.com/data/icons/vector-basic-tab-bar-icons/48/play_button-128.png) center center no-repeat;
  position: absolute;
  top: 50%;
  left: 50%;
  width: 74px;
  height: 74px;
  margin: -37px 0 0 -37px;
  z-index: 10;
  opacity: .6;
}

.ytvideo {
  position: relative;
  margin: 0;
  padding: 0;
  background-position: center;
  background-size: contain;
  background-repeat: no-repeat;
  -webkit-background-size: cover;
  /* pour anciens Chrome et Safari */
  background-size: cover;
  /* version standardisée */
  cursor: pointer;
}

.ytvideo iframe {
  border-style: none;
  height: 100%;
  width: 100%;
}

.ytvideo .seo {
  display: none;
}

#p0 { text-indent: 2em; }
#p1 { text-indent: 4em; }
#p2 { text-indent: 15px; }
#p3 { text-indent: 10%; }