@media screen and (max-width: 680px) {
  .menu_block {
    position: absolute !important;
    background-color: transparent !important;
  }
  .menu_block a {
    margin-bottom: 40px !important;
  }
  .menu_block a.hidden {
    display: inline-block !important;
  }
  .menu_block .mail {
    margin-top: 40px;
  }
  .menu_drop {
    display: none !important;
  }
  .posters_block {
    opacity: 0.5;
  }
}
html,
body,
.main_block {
  height: 100%;
}
.posters_block .poster_item {
  display: block;
  max-width: 75%;
  max-height: 75%;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  cursor: pointer;
  visibility: hidden;
  opacity: 0;
  -webkit-transition: visibility 0s linear 0.5s, opacity 0.5s linear;
  -o-transition: visibility 0s linear 0.5s, opacity 0.5s linear;
  transition: visibility 0s linear 0.5s, opacity 0.5s linear;
}
.posters_block .poster_item.active {
  visibility: visible;
  opacity: 1;
  -webkit-transition-delay: 0s;
       -o-transition-delay: 0s;
          transition-delay: 0s;
}
.footer_block {
  bottom: 20px;
  width: 100%;
  position: absolute;
  padding-top: 50px;
}