html, body, .page-wrapper {
  height: 100%;
}

.page-wrapper {
    display: -webkit-flexbox;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-flex-align: center;
    -ms-flex-align: center;
    -webkit-align-items: center;
    align-items: center;
    justify-content: center;
}

.logo-content {
  max-width: 580px;
}
.logo-content p {
  padding-top: 3em;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1.2em;
  text-align: center;
}
.logo-content p.sml {
  font-size: 0.85em;
  font-style: italic;
  text-align: right;
}

.logo-content .img-wrapper {
  position: relative;
  margin: 0 auto;
}

.logo-content .img-wrapper img {
  position: absolute;
  left: 0;
  -webkit-transition: opacity 1s ease-in-out;
  -moz-transition: opacity 1s ease-in-out;
  -o-transition: opacity 1s ease-in-out;
  transition: opacity 1s ease-in-out;
}

@keyframes cf3FadeInOut {
  0% {
    opacity:1;
  }
  45% {
    opacity:1;
  }
  55% {
    opacity:0;
  }
  100% {
    opacity:0;
  }
}

.logo-content .img-wrapper img.img-first {
  animation-name: cf3FadeInOut;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
  animation-duration: 3s;
  animation-direction: alternate;
}