.slider {
  max-width: 300px;
  height: 500px;
  margin: 20px auto;
  position: relative;
}
.slide1 {
  background: url(images/screen1_framed.png)no-repeat center;
  animation:fade 19s infinite;
  -webkit-animation:fade 19s infinite;
} 
.slide2 {
  background: url(images/screen2_framed.png)no-repeat center;
  animation:fade2 19s infinite;
  -webkit-animation:fade2 19s infinite;
}
.slide3 {
  background: url(images/screen1_framed.png)no-repeat center;
  animation:fade3 19s infinite;
  -webkit-animation:fade3 19s infinite;
}
.slide4 {
  background: url(images/screen2_framed.png)no-repeat center;
  animation:fade4 19s infinite;
  -webkit-animation:fade4 19s infinite;
}
.slide5 {
  background: url(images/screen1_framed.png)no-repeat center;
  animation:fade5 19s infinite;
  -webkit-animation:fade5 19s infinite;
}
.slide6 {
  background: url(images/screen2_framed.png)no-repeat center;
  animation:fade6 19s infinite;
  -webkit-animation:fade6 19s infinite;
}
.slide7 {
  background: url(images/screen1_framed.png)no-repeat center;
  animation:fade7 19s infinite;
  -webkit-animation:fade7 19s infinite;
}
.slide {
  position: absolute;
  width: 100%;
  height: 100%;
  background-size: contain;
}
@keyframes fade
{
  0%   {opacity:1}
  14.285% { opacity: 0}
  28.571% { opacity: 0}
  42.856% { opacity: 0}
  57.141% { opacity: 0}
  71.426% { opacity: 0}
  85.711% { opacity: 0}
  100% { opacity: 1}
}
@keyframes fade2
{
  0%   {opacity:0}
  14.285% { opacity: 1}
  28.571% { opacity: 0}
  42.856% { opacity: 0}
  57.141% { opacity: 0}
  71.426% { opacity: 0}
  85.711% { opacity: 0}
  100% { opacity: 0}
}
@keyframes fade3
{
  0%   {opacity:0}
  14.285% { opacity: 0}
  28.571% { opacity: 1}
  42.856% { opacity: 0}
  57.141% { opacity: 0}
  71.426% { opacity: 0}
  85.711% { opacity: 0}
  100% { opacity: 0}
}
@keyframes fade4
{
  0%   {opacity:0}
  14.285% { opacity: 0}
  28.571% { opacity: 0}
  42.856% { opacity: 1}
  57.141% { opacity: 0}
  71.426% { opacity: 0}
  85.711% { opacity: 0}
  100% { opacity: 0}
}
@keyframes fade5
{
  0%   {opacity:0}
  14.285% { opacity: 0}
  28.571% { opacity: 0}
  42.856% { opacity: 0}
  57.141% { opacity: 1}
  71.426% { opacity: 0}
  85.711% { opacity: 0}
  100% { opacity: 0}
}
@keyframes fade6
{
  0%   {opacity:0}
  14.285% { opacity: 0}
  28.571% { opacity: 0}
  42.856% { opacity: 0}
  57.141% { opacity: 0}
  71.426% { opacity: 1}
  85.711% { opacity: 0}
  100% { opacity: 0}
}
@keyframes fade7
{
  0%   {opacity:0}
  14.285% { opacity: 0}
  28.571% { opacity: 0}
  42.856% { opacity: 0}
  57.141% { opacity: 0}
  71.426% { opacity: 0}
  85.711% { opacity: 1}
  100% { opacity: 0}
}